Presents Electricity Magnetism Lessons Teacher Training 4 th

Presents: Electricity & Magnetism Lessons Teacher Training 4 th Grade Strand 5: Physical Science Standards Concept 3: Energy and Magnetism 3/9/2021 1

Teacher Training Overview l Review Training Objectives & State Standards l Magnetism l Electricity 3/9/2021 basics & activities 2

1 st Magnetism Activity l “Magnetic 3/9/2021 Characteristics” 3

What is Magnetism? l Any material that attracts iron, steel, cobalt and nickel l Can be permanent or temporary 3/9/2021 4

Magnetism Basics Only Certain Types of Materials Exhibit Magnetism N S Magnets can be made in a variety of shapes, but all magnets have 2 poles • Opposite poles attract • Like poles repel All magnets have lines of force extending from one pole to the other in the 3 dimensional space around them 3/9/2021 5

Magnetic Lines of Flux Magnetic Field Magnetic lines do not cross each other. The lines go from North to South on the magnet. 3/9/2021 N magnet S 6

Magnets Attracting Each Other N N S S Pulling 3/9/2021 7

Magnets Opposing Each Other N S Pushing Apart 3/9/2021 8

2 nd Magnetism Activity l Magnetic 3/9/2021 Lines of Flux 9

What are the characteristics? l North and south poles ¡ “di”-poles ¡ Break the magnet in half and you will have two separate magnets l 3 dimensional field of attraction l Transfer 3/9/2021 magnetic properties 10

Where does it come from? l Nature l Man-made materials from: ¡ ¡ ¡ l Ceramic Alnico (aluminum, nickel, & cobalt) Flexible rubber-like material Created using current (electricity) 3/9/2021 11

3 rd Magnetic Activity l Paperclip 3/9/2021 Pick-up 12

Uses for Magnets in Everyday Life l Cars ¡ l Homes ¡ ¡ ¡ l Power locks Door bells Microwaves TV’s Refrigerators Speakers Electricity Schools ¡ 3/9/2021 Whiteboards 13

Magnetism Activities l “Magnetic l Lines Characteristics” of Flux Activity l “Paper Clip Pick Up” l Summarize worksheets 3/9/2021 findings & Review class 14

Electricity Lesson Plan l Review AZ state standards the lesson plan covers l Review the student objectives covered in the lesson plan 3/9/2021 15

Safety Note Always be careful around electricity. l Make sure an adult is present during experiments and demonstrations using electricity. l Use only low voltage for demonstrations (6 volts dc or less) l Take care to prevent shorts on batteries l ¡ ¡ l Never allow the positive and negative terminals to touch the same metal object (short) Use plastic covers on batteries when not in use Never use electricity from a wall outlet in any of these classroom demonstration. Use the batteries and genecons provided. 3/9/2021 16

Electricity Basics Electricity is…. . • • The flow of electrons The energy sent out by batteries and generators (current electricity) The shock you can get from rubbing your feet on the carpet (static electricity) A bolt of lightning! (static electricity) 3/9/2021 17

All Matter is Made up of Atoms MATTER (water, diamond) ELEMENTS O H (oxygen, carbon) H ATOMS (particles) 3/9/2021 18

Atoms What is an Atom? ¡ The smallest component in all things ¡ Made up of three smaller particles Protons (+) l Neutrons (no charge) l Electrons (-) l ¡ Strive l 3/9/2021 for stability Charged atom = ion 19

Opposites Attract ++ l 3/9/2021 Attraction _ _ Particles with opposite charges attract each other. 20

Charged Atom (Ion) +++ ++ ---- Stable Atom Positive Ion Negative Ion Stable atoms have equal protons and electron l Stable atoms have no charge l Free electrons will seek positively charged ions to create stability l 3/9/2021 21

1 st Electricity Activity l “Opposites 3/9/2021 Attract” 22

Electricity & Ben Franklin Benjamin Franklin (1706 -1790) l 1740’s – Proposed the notion of positive and negative charges maintain a balance except when influenced by some means. l 1752 – Famous kite experiments identify lightning as a form of electrical discharge. 3/9/2021 23

Static Electricity l The imbalance of positive and negative charges l Example: a build up of negative charges in a storm cloud will travel to the ground in the form of lightening 3/9/2021 24

2 nd Electricity Activity l “Balloons 3/9/2021 and Electrons” 25

Static Electricity Start with a doorknob – no charge Walk along carpet: strip electrons from carpet that collect in your body… You become negatively charged l Approach the doorknob and the positive charges move toward you. Negative charges move away. l l 3/9/2021 26

Static Electricity l When close enough, the electrons will jump toward the positive doorknob and ZAP! You’ve been shocked by static electricity. 3/9/2021 27

Static Electricity l When close enough, the electrons will jump toward the positive doorknob and ZAP! You’ve been shocked by static electricity. l Now you and the doorknob have the same charge. 3/9/2021 28

Current Electricity l Electric current is the movement of free electrons from atom to atom l To start the free electrons moving an electromotive force is needed. ¡ ¡ 3/9/2021 Generator Batteries 29

3 rd Electricity Activity l Demonstration of Electromotive Force/ Current Electricity 3/9/2021 30

Electricity Activities l “Balloons l “Flow and Electrons” of Electrons” l Demonstration l Summarize Worksheets 3/9/2021 of Electromotive Force Results & Review Class 31

References l www. srpnet. com l www. ieee. org l www. coolmagnetman. com/magreview. htm l www. en. wikipedia. org/wiki/Magnets l www. creativekidsathome. com/science/magnetexp. html l www. howstuffworks. com l www. eia. doe. gov/kids/glossary 3/9/2021 32