ELECTRICITY Electric Charge Atoms are made up of
![ELECTRICITY ELECTRICITY](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-1.jpg)
![Electric Charge § Atoms are made up of 3 particles – – – Neutrons Electric Charge § Atoms are made up of 3 particles – – – Neutrons](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-2.jpg)
![“Electrons” clip “Electrons” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-3.jpg)
![Charges § Handy rule : Opposites attract And likes repel Charges § Handy rule : Opposites attract And likes repel](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-4.jpg)
![Electric fields § Every electric charge is surrounded by an electric field which can Electric fields § Every electric charge is surrounded by an electric field which can](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-5.jpg)
![2 types of electricity § Static electricity §Electric current 2 types of electricity § Static electricity §Electric current](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-6.jpg)
![§ Static electricity is an accumulation of electric charges on an object. Neutral Charge § Static electricity is an accumulation of electric charges on an object. Neutral Charge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-7.jpg)
![Charging objects § Objects can become charged by a variety of methods § 2 Charging objects § Objects can become charged by a variety of methods § 2](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-8.jpg)
![Charging by Contact § Objects touch or rub against each other (contact) and charge Charging by Contact § Objects touch or rub against each other (contact) and charge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-9.jpg)
![Charging by Induction § Occurs when a charged object is brought near a neutral Charging by Induction § Occurs when a charged object is brought near a neutral](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-10.jpg)
![§ Once objects are charged, they can then transfer their charge…sometimes, suddenly, in what § Once objects are charged, they can then transfer their charge…sometimes, suddenly, in what](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-11.jpg)
![“Balloons on the Wall” clip “Balloons on the Wall” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-12.jpg)
![Conductors and Insulators Conductors = materials which allow excess electrons to easily move through Conductors and Insulators Conductors = materials which allow excess electrons to easily move through](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-13.jpg)
![Conductors and Insulators Insulator = a material that doesn’t allow electrons to move through Conductors and Insulators Insulator = a material that doesn’t allow electrons to move through](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-14.jpg)
![“Conductors and insulators” clip “Conductors and insulators” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-15.jpg)
![§ A device made up of two thin metal leaves attached to a knobbed § A device made up of two thin metal leaves attached to a knobbed](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-16.jpg)
![Lightning Large static discharge Air masses move and swirl Top + Bottom - Negative Lightning Large static discharge Air masses move and swirl Top + Bottom - Negative](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-17.jpg)
![When electrons get close to ground Bottom accumulates enough Electrons in cloud attracted to When electrons get close to ground Bottom accumulates enough Electrons in cloud attracted to](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-18.jpg)
![Electric charges move through air collide with atoms/molecules Collisions cause atoms/molecules to emit light Electric charges move through air collide with atoms/molecules Collisions cause atoms/molecules to emit light](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-19.jpg)
![Electrons are ripped off atoms in the air Produce great amounts of heat Powerful Electrons are ripped off atoms in the air Produce great amounts of heat Powerful](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-20.jpg)
![Warms surrounding air to 25, 000 C (2. 5 x hotter than Sun surface) Warms surrounding air to 25, 000 C (2. 5 x hotter than Sun surface)](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-21.jpg)
![Heat causes air in path to expand rapidly sound waves = Thunder Heat causes air in path to expand rapidly sound waves = Thunder](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-22.jpg)
![Earth is a large neutral object Connection (conductor) will transfer any excess electric charge Earth is a large neutral object Connection (conductor) will transfer any excess electric charge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-23.jpg)
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-24.jpg)
![“Lightning” clip “Lightning” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-25.jpg)
![“Van de Graff” clip with safety from static discharge “Van de Graff” clip with safety from static discharge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-26.jpg)
![Video quiz static electricity Video quiz static electricity](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-27.jpg)
![Resistance § RESISTANCE is the tendency for a material to oppose the flow of Resistance § RESISTANCE is the tendency for a material to oppose the flow of](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-28.jpg)
![§ The amount of resistance is different for each type of conductor. § Resistance § The amount of resistance is different for each type of conductor. § Resistance](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-29.jpg)
![Resistance in wires § Resistance is caused by electrons running into each other or Resistance in wires § Resistance is caused by electrons running into each other or](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-30.jpg)
![§ The resistance of a material will increase (↑) as the temperature increases (↑) § The resistance of a material will increase (↑) as the temperature increases (↑)](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-31.jpg)
![Electric Current § Similar to HEAT which flows from areas of high temps to Electric Current § Similar to HEAT which flows from areas of high temps to](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-32.jpg)
![Comparison of GPE to potential difference Potential Energy (height) 1. 5 V Potential Difference Comparison of GPE to potential difference Potential Energy (height) 1. 5 V Potential Difference](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-33.jpg)
![Electrical Energy Moving electrons in a path is electricity § Electrical Potential Difference (v) Electrical Energy Moving electrons in a path is electricity § Electrical Potential Difference (v)](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-34.jpg)
![Circuits – 2 types § Series circuits are the most simple. § One COMPLETE Circuits – 2 types § Series circuits are the most simple. § One COMPLETE](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-35.jpg)
![Circuits – 2 types § Parallel circuits provide more than one path for the Circuits – 2 types § Parallel circuits provide more than one path for the](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-36.jpg)
![Which switches, if opened, will cause the light bulb to stop glowing? F. Q Which switches, if opened, will cause the light bulb to stop glowing? F. Q](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-37.jpg)
![USE THE FORMULA SHEET!! § What is the current in a copper wire that USE THE FORMULA SHEET!! § What is the current in a copper wire that](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-38.jpg)
![Electrocution Electrocution](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-39.jpg)
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![Historical perspective on Electricity § 600 B. C. Thales of Miletus writes that the Historical perspective on Electricity § 600 B. C. Thales of Miletus writes that the](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-42.jpg)
![250 B. C. § Baghdad Battery – Object found in Iraq in 1938 (and 250 B. C. § Baghdad Battery – Object found in Iraq in 1938 (and](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-43.jpg)
![1550 A. D. § Italian physician Girolamo Cardano in his De Subtilitate distinguishes difference 1550 A. D. § Italian physician Girolamo Cardano in his De Subtilitate distinguishes difference](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-44.jpg)
![1600 A. D. § English scientist William Gilbert writes De Magnate coined the Latin 1600 A. D. § English scientist William Gilbert writes De Magnate coined the Latin](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-45.jpg)
![§ 1660 A. D. Otto von Guericke invents an electrostatic generator § 1675 A. § 1660 A. D. Otto von Guericke invents an electrostatic generator § 1675 A.](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-46.jpg)
![§ 1729 A. D. Stephen Gray classifies materials as either conductors or insulators § § 1729 A. D. Stephen Gray classifies materials as either conductors or insulators §](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-47.jpg)
![1752 A. D. § Benjamin Franklin legend says that he conducted famous, yet extremely 1752 A. D. § Benjamin Franklin legend says that he conducted famous, yet extremely](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-48.jpg)
![§ Franklin invented the lightning rod to protect structures by directing the charge to § Franklin invented the lightning rod to protect structures by directing the charge to](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-49.jpg)
![Nikola Tesla Michael Faraday Thomas Edison Nikola Tesla Michael Faraday Thomas Edison](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-50.jpg)
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- Slides: 53
![ELECTRICITY ELECTRICITY](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-1.jpg)
ELECTRICITY
![Electric Charge Atoms are made up of 3 particles Neutrons Electric Charge § Atoms are made up of 3 particles – – – Neutrons](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-2.jpg)
Electric Charge § Atoms are made up of 3 particles – – – Neutrons have a neutral charge. Protons have a positive charge. Electrons have a negative charge. § An atom is electrically neutral if the number of electrons EQUALS the number of protons § However, atoms sometimes LOSE or GAIN electrons. § When excess (or extra) electrons are stored, an overall NEGATIVE (-) charge is achieved
![Electrons clip “Electrons” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-3.jpg)
“Electrons” clip
![Charges Handy rule Opposites attract And likes repel Charges § Handy rule : Opposites attract And likes repel](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-4.jpg)
Charges § Handy rule : Opposites attract And likes repel
![Electric fields Every electric charge is surrounded by an electric field which can Electric fields § Every electric charge is surrounded by an electric field which can](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-5.jpg)
Electric fields § Every electric charge is surrounded by an electric field which can exert a force on objects which come into it. These fields can push or pull over distances
![2 types of electricity Static electricity Electric current 2 types of electricity § Static electricity §Electric current](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-6.jpg)
2 types of electricity § Static electricity §Electric current
![Static electricity is an accumulation of electric charges on an object Neutral Charge § Static electricity is an accumulation of electric charges on an object. Neutral Charge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-7.jpg)
§ Static electricity is an accumulation of electric charges on an object. Neutral Charge Negative Charge transferred -
![Charging objects Objects can become charged by a variety of methods 2 Charging objects § Objects can become charged by a variety of methods § 2](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-8.jpg)
Charging objects § Objects can become charged by a variety of methods § 2 ways are – Charging by CONTACT – Charging by INDUCTION
![Charging by Contact Objects touch or rub against each other contact and charge Charging by Contact § Objects touch or rub against each other (contact) and charge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-9.jpg)
Charging by Contact § Objects touch or rub against each other (contact) and charge is transferred
![Charging by Induction Occurs when a charged object is brought near a neutral Charging by Induction § Occurs when a charged object is brought near a neutral](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-10.jpg)
Charging by Induction § Occurs when a charged object is brought near a neutral object. The charges in the neutral object rearrange themselves and present the illusion of a charge.
![Once objects are charged they can then transfer their chargesometimes suddenly in what § Once objects are charged, they can then transfer their charge…sometimes, suddenly, in what](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-11.jpg)
§ Once objects are charged, they can then transfer their charge…sometimes, suddenly, in what is called a STATIC DISCHARGE.
![Balloons on the Wall clip “Balloons on the Wall” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-12.jpg)
“Balloons on the Wall” clip
![Conductors and Insulators Conductors materials which allow excess electrons to easily move through Conductors and Insulators Conductors = materials which allow excess electrons to easily move through](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-13.jpg)
Conductors and Insulators Conductors = materials which allow excess electrons to easily move through them. Examples : metals, water The Earth also functions as a conductor.
![Conductors and Insulators Insulator a material that doesnt allow electrons to move through Conductors and Insulators Insulator = a material that doesn’t allow electrons to move through](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-14.jpg)
Conductors and Insulators Insulator = a material that doesn’t allow electrons to move through it easily Examples : plastic around wires, wood doors, fiberglass, rubbers Notice what the handles are made of. Why?
![Conductors and insulators clip “Conductors and insulators” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-15.jpg)
“Conductors and insulators” clip
![A device made up of two thin metal leaves attached to a knobbed § A device made up of two thin metal leaves attached to a knobbed](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-16.jpg)
§ A device made up of two thin metal leaves attached to a knobbed metal rod. The leaves can move and hang straight down when not charged. This device is used to detect electric charges. Electroscope
![Lightning Large static discharge Air masses move and swirl Top Bottom Negative Lightning Large static discharge Air masses move and swirl Top + Bottom - Negative](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-17.jpg)
Lightning Large static discharge Air masses move and swirl Top + Bottom - Negative charge induces a + charge on ground (repel e-)
![When electrons get close to ground Bottom accumulates enough Electrons in cloud attracted to When electrons get close to ground Bottom accumulates enough Electrons in cloud attracted to](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-18.jpg)
When electrons get close to ground Bottom accumulates enough Electrons in cloud attracted to ground Positive charges are attracted Connection made = lightning
![Electric charges move through air collide with atomsmolecules Collisions cause atomsmolecules to emit light Electric charges move through air collide with atoms/molecules Collisions cause atoms/molecules to emit light](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-19.jpg)
Electric charges move through air collide with atoms/molecules Collisions cause atoms/molecules to emit light
![Electrons are ripped off atoms in the air Produce great amounts of heat Powerful Electrons are ripped off atoms in the air Produce great amounts of heat Powerful](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-20.jpg)
Electrons are ripped off atoms in the air Produce great amounts of heat Powerful sound waves
![Warms surrounding air to 25 000 C 2 5 x hotter than Sun surface Warms surrounding air to 25, 000 C (2. 5 x hotter than Sun surface)](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-21.jpg)
Warms surrounding air to 25, 000 C (2. 5 x hotter than Sun surface)
![Heat causes air in path to expand rapidly sound waves Thunder Heat causes air in path to expand rapidly sound waves = Thunder](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-22.jpg)
Heat causes air in path to expand rapidly sound waves = Thunder
![Earth is a large neutral object Connection conductor will transfer any excess electric charge Earth is a large neutral object Connection (conductor) will transfer any excess electric charge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-23.jpg)
Earth is a large neutral object Connection (conductor) will transfer any excess electric charge “Grounding” – the act of making a connection for an electric charge to go to the Earth (Lightning rods)
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-24.jpg)
![Lightning clip “Lightning” clip](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-25.jpg)
“Lightning” clip
![Van de Graff clip with safety from static discharge “Van de Graff” clip with safety from static discharge](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-26.jpg)
“Van de Graff” clip with safety from static discharge
![Video quiz static electricity Video quiz static electricity](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-27.jpg)
Video quiz static electricity
![Resistance RESISTANCE is the tendency for a material to oppose the flow of Resistance § RESISTANCE is the tendency for a material to oppose the flow of](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-28.jpg)
Resistance § RESISTANCE is the tendency for a material to oppose the flow of electrons. § Causes the ELECTRICAL energy to change into THERMAL energy and LIGHT. § Filament in light-bulb has high resistance so it heats up and glows
![The amount of resistance is different for each type of conductor Resistance § The amount of resistance is different for each type of conductor. § Resistance](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-29.jpg)
§ The amount of resistance is different for each type of conductor. § Resistance is measured in ohms. Its symbol is Ω. This is the Greek letter omega
![Resistance in wires Resistance is caused by electrons running into each other or Resistance in wires § Resistance is caused by electrons running into each other or](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-30.jpg)
Resistance in wires § Resistance is caused by electrons running into each other or the walls of the wire. § Resistance is caused by friction which means heat will be present. Longer, thin wires have MORE resistance than short, thick wires
![The resistance of a material will increase as the temperature increases § The resistance of a material will increase (↑) as the temperature increases (↑)](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-31.jpg)
§ The resistance of a material will increase (↑) as the temperature increases (↑) in most conductors. § This is why electrical equipment does not work as well if it has been on for an extended time.
![Electric Current Similar to HEAT which flows from areas of high temps to Electric Current § Similar to HEAT which flows from areas of high temps to](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-32.jpg)
Electric Current § Similar to HEAT which flows from areas of high temps to areas of low temps, ELECTRONS flow from places of high potential energy to places of lower PE. § A negatively charged object has more PE than an uncharged one § When electrons do get to move (like in a spark of static discharge) the potentials become equal and the flow stops.
![Comparison of GPE to potential difference Potential Energy height 1 5 V Potential Difference Comparison of GPE to potential difference Potential Energy (height) 1. 5 V Potential Difference](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-33.jpg)
Comparison of GPE to potential difference Potential Energy (height) 1. 5 V Potential Difference 1. 5 Meters 0. 0 V To Lower Energy The potential difference (voltage) is 1. 5 V.
![Electrical Energy Moving electrons in a path is electricity Electrical Potential Difference v Electrical Energy Moving electrons in a path is electricity § Electrical Potential Difference (v)](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-34.jpg)
Electrical Energy Moving electrons in a path is electricity § Electrical Potential Difference (v) is measured in Volts § The rate of moving electric charges, Electric Current (I), is measured in Amperes § Resistance or opposition to the movement of the energy is called Resistance (R). § I=V R
![Circuits 2 types Series circuits are the most simple One COMPLETE Circuits – 2 types § Series circuits are the most simple. § One COMPLETE](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-35.jpg)
Circuits – 2 types § Series circuits are the most simple. § One COMPLETE (1) path for the current to travel. § Contains an energy source, a path, and a load (something for it to do, like a lamp)
![Circuits 2 types Parallel circuits provide more than one path for the Circuits – 2 types § Parallel circuits provide more than one path for the](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-36.jpg)
Circuits – 2 types § Parallel circuits provide more than one path for the current to travel. § Most circuits are parallel, since if one lamp goes out, the others can stay lit.
![Which switches if opened will cause the light bulb to stop glowing F Q Which switches, if opened, will cause the light bulb to stop glowing? F. Q](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-37.jpg)
Which switches, if opened, will cause the light bulb to stop glowing? F. Q G. R It is the only H. S switch in J. T series to both the battery and light.
![USE THE FORMULA SHEET What is the current in a copper wire that USE THE FORMULA SHEET!! § What is the current in a copper wire that](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-38.jpg)
USE THE FORMULA SHEET!! § What is the current in a copper wire that has a resistance of 2 ohms and is connected to a 9 volt electrical source? A. B. C. D. 0. 22 amp 4. 5 amps 11. 0 amps 18. 0 amps V = I R so, 9 V = I x 2 ohms or 4. 5 amps
![Electrocution Electrocution](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-39.jpg)
Electrocution
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-40.jpg)
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-41.jpg)
![Historical perspective on Electricity 600 B C Thales of Miletus writes that the Historical perspective on Electricity § 600 B. C. Thales of Miletus writes that the](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-42.jpg)
Historical perspective on Electricity § 600 B. C. Thales of Miletus writes that the Greeks had discovered that rubbing fur on certain substances such as amber would cause an attraction between the two. The amber would attract light things such as hair and if rubbed long enough produced a spark.
![250 B C Baghdad Battery Object found in Iraq in 1938 and 250 B. C. § Baghdad Battery – Object found in Iraq in 1938 (and](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-43.jpg)
250 B. C. § Baghdad Battery – Object found in Iraq in 1938 (and dated back to 250 BC) resembles a galvanic cell and is thought to have been used for electroplating – Electroplating is the use of electricity to cover something with certain metals
![1550 A D Italian physician Girolamo Cardano in his De Subtilitate distinguishes difference 1550 A. D. § Italian physician Girolamo Cardano in his De Subtilitate distinguishes difference](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-44.jpg)
1550 A. D. § Italian physician Girolamo Cardano in his De Subtilitate distinguishes difference between electrical and magnetic forces
![1600 A D English scientist William Gilbert writes De Magnate coined the Latin 1600 A. D. § English scientist William Gilbert writes De Magnate coined the Latin](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-45.jpg)
1600 A. D. § English scientist William Gilbert writes De Magnate coined the Latin word electricus from the Greek word ηλεκτρον (elektron), § Ηλεκτρον means “amber” in Greek § English words electric and electricity came from
![1660 A D Otto von Guericke invents an electrostatic generator 1675 A § 1660 A. D. Otto von Guericke invents an electrostatic generator § 1675 A.](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-46.jpg)
§ 1660 A. D. Otto von Guericke invents an electrostatic generator § 1675 A. D. Robert Boyle determines that electric forces can attract or repel through a vacuum
![1729 A D Stephen Gray classifies materials as either conductors or insulators § 1729 A. D. Stephen Gray classifies materials as either conductors or insulators §](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-47.jpg)
§ 1729 A. D. Stephen Gray classifies materials as either conductors or insulators § 1729 A. D. C. F. Du Fay identifies positive and negative charges
![1752 A D Benjamin Franklin legend says that he conducted famous yet extremely 1752 A. D. § Benjamin Franklin legend says that he conducted famous, yet extremely](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-48.jpg)
1752 A. D. § Benjamin Franklin legend says that he conducted famous, yet extremely dangerous experiment of flying kite with metal key attached during lightning storm linking lightning with electricity. He saw that the fibers on the string were standing up and also received a shock from the key when he touched it.
![Franklin invented the lightning rod to protect structures by directing the charge to § Franklin invented the lightning rod to protect structures by directing the charge to](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-49.jpg)
§ Franklin invented the lightning rod to protect structures by directing the charge to the ground. • Georg Wilhelm Richmann of St. Petersburg, Russia died performing kite experiment in 1753
![Nikola Tesla Michael Faraday Thomas Edison Nikola Tesla Michael Faraday Thomas Edison](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-50.jpg)
Nikola Tesla Michael Faraday Thomas Edison
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-51.jpg)
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-52.jpg)
![](https://slidetodoc.com/presentation_image_h2/5e433140ffca35062bcae315a62e54b8/image-53.jpg)
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