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An electric current is caused by electrons flowing through metal wires from atom to atom, though the electrons themselves are too small to be seen. Various thinking models have been developed to help explain electricity and its effects, like making a bulb light up or a motor run, since electricity itself can't be seen directly. One such model represents electricity as the flow of marbles, balls, or water to illustrate how a current is produced and how components like batteries work in a circuit.
watcher 3 stream
- 1. An electric current is a flow of electrons through metal wires. The electrons are tiny particles of matter called electrons that jump from atom to atom. These tiny electrons are so very small they can’t be seen. It takes energy to make them move So you can’t see electricity, so electromancy has thinking models to help you understand. But don’t confuse ‘seeing’ electricity with seeing the effects a current can produce . 3 Engage Explore Explain Elaborate Extend Evaluate Elicit
- 2. Later ...
- 3. What are the ‘electrons’ that ‘flow’ in the three models? What is the battery in each model? What is a ‘big current’ like in each model? Which model do you think is best? Task: draw a picture of one of the models, explaining why it is like an electrical circuit. Student Sheet 1 7 Electricity models 1 Electricity models 3 Electricity models 2 Engage Explore Explain Elaborate Extend Evaluate Elicit
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- 5. PRACTICAL How could you make the bulb bright and the motor run fast? Prove this with ‘spark stream’ readings This will test your skill. Set up this circuit. Add an ammeter 9 Now add a bulb in series with the motor. Does it still work as well? Engage Explore Explain Elaborate Extend Evaluate Elicit
Editor's Notes
- #2: Student sheet 1 goes with this slide