Electricity Review Static Electricity Circuits Part Deux Safety
- Slides: 52
Electricity Review
Static Electricity Circuits Part Deux Safety In the House 10 10 10 20 20 20 30 30 30 40 40 40 50 50 50
Question 1 - 10 • What is electricity
Answer 1 – 10 • Electricity is the set of physical phenomena associated with the presence and flow of electric charge.
Question 1 - 20 • If you rub plastic and fur together what will happen, with respect to charge, to each of those substances?
Answer 1 – 20 • Fur will loose electrons and become positively charged and plastic will gain electrons and become negatively charged.
Question 1 - 30 • What is conductivity and how does an insulator differ from a conductor? – Be sure to include an example of the conductor and the insulator.
Answer 1 – 30 • Conductivity – ability of materials to allow electrons to move freely in them – Insulator – solid, liquid or gas resisting flow of electrons – Conductor – solid, liquid or gas allowing flow of electrons
Question 1 - 40 • If you were to bring a negatively charged balloon close to a wall. Explain, using two laws, what will happen to the charges in the wall.
Answer 1 – 40 • Negative will move inward, positive will remain to hold balloon • Law of Attraction and Repulsion – Opposites attract – Like charges repel
Question 1 - 50 • What is an electroscope and how does it demonstrate induction?
Answer 1 – 50 • Electroscope – detects static charge • Induction – movement of electrons within a substance caused by a nearby charged object, without direct contact between the substance and the object.
Question 2 - 10 • Draw and name three symbols from a schematic circuit diagram.
Answer 2 – 10
Question 2 - 20 • What is an electrochemical cell? – How does an electrolyte differ from an electrode in an electrochemical cell?
Answer 2 – 20 • A battery is a combination of electrochemical cells – Electrochemical cells are packages of chemicals that convert chemical energy into electrical energy – Electrolyte – liquid or paste that conducts electricity because it contains chemicals that form ions. – Electrodes – metal strips that react with the electrolyte – Chemical reaction allows electrons to collect on one of the electrodes making it negatively charged.
Question 2 - 30 • Draw a schematic diagram for a circuit with a 9 V battery, two equal resistors, a switch an ammeter and a voltmeter measuring current across one of the resistors indicating what the voltage would be.
Answer 2 – 30 • Diagram
Question 2 - 40 • How does a wet cell differ from a dry cell? Be sure to include examples.
Answer 2 – 40 • Dry cell – uses a paste electrolyte • Wet cell – uses a liquid electrolyte
Question 2 - 50 • Please define current, voltage and resistance.
Answer 2 – 50 • The difference in electrical potential energy between two points in a circuit is called the potential difference • Electric Current is a measure of the amount of electric charge that passes a point in an electric circuit each second. • Degree to which a substance opposes flow of electric current through it. – This resistance slows down the flow of electrons and therefore it slows down the current and converts electrical energy into other forms of energy
Question 3 - 10 • How does a series circuit differ from a parallel circuit?
Answer 3 – 10 • Parallel - Components are arranged so that electrons can flow along more than one path – A break does not affect all loads • Components are arranged one after another in series – One light goes out, they all go out – Add more resistance and you decrease the current
Question 3 - 20 • Draw a parallel circuit with a 9 V battery, three resistors each with its own switch, an ammeter measuring current out of the second resistor and a voltmeter measuring the voltage across the third resistor.
Answer 3 – 20 • Drawing
Question 3 - 30 • What is Ohm’s Law
Answer 3 – 30 • As long as temperature stays the same, V=IR
Question 3 - 40 • A current of 2. 3 A flows through a 50 ohm resistor that is connect to a battery. What is the voltage of the battery?
Answer 3 – 40 • 115 V
Question 3 - 50 • A current of 675 m. A runs through a resistor that is connected to a 120 V power supply. What is the resistance of the bulb?
Answer 3 – 50 • 177. 78 ohms
Question 4 - 10 • What is a short circuit?
Answer 4 – 10 • Accidental low resistance connection between two points in a circuit, causing excess current flow. • Electrical devices will not work and will be dangerous – heat or fire.
Question 4 - 20 • Compare and contrast fuses and circuit breakers.
Answer 4 – 20 • Fuse = safety device in an electrical circuit that has a low melting point, compared to wires. • Circuit breaker = does the same thing but instead of melting, the wire heats up and bends which triggers a spring mechanism to turn off the electricity
Question 4 - 30 • Identify two electrical safety devices involved with plugging in an appliance. – Think plug and appliance – Explain how they work.
Answer 4 – 30
Question 4 - 40 • Why must you avoid frayed electrical cords.
Answer 4 – 40 • Electric Shock…short circuit.
Question 4 - 50 • You want to find the value of an unknown resistor however you have access to a multimeter. • How could you figure it out?
Answer 4 – 50 • R = V/I • Use the ohmmeter function
Question 5 - 10 • What does time of use (TOU) electricity billing mean?
Answer 5 – 10 • Smart meters send usage of electricity on a house by house basis to the electric company so that the house gets charged the right amount
Question 5 - 20 • If a kettle uses 1. 5 k. W per hour and you have it on for 15 minutes every day, how much does your energy cost per year. – Assume energy costs you $0. 105/hour.
Answer 5 – 20 • $14. 37
Question 5 - 30 • What is the percent efficiency of a bulb that has 1000 joules of energy going in but only 600 joules of energy coming out?
Answer 5 – 30 • 600/1000 x 100 = 60% efficient
Question 5 - 40 • How does Energuide differ from Enerstar?
Answer 5 – 40 • Energuide – average energy use in a month or year for an appliance compared to other similar appliances. • Energy Star – means the appliance is one of the most efficient appliances in its class.
Question 5 - 50 • What are 5 things you can do at home to reduce energy consumption, or at least reduce the cost of your energy bill.
Answer 5 – 50 • OPEN
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