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# Y8 Electricity 04 resistance

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### Y8 Electricity 04 resistance

1. 1. Resistance <ul><li>Learning Objective : </li></ul><ul><li>To describe the effect of resistance on current in a circuit. </li></ul><ul><li>Starter : </li></ul><ul><li>What do you think will happen to the flow of water as it passes the squeeze in the pipe? </li></ul><ul><li>water </li></ul>
2. 2. Write your own definitions for Conductors & Insulators <ul><li>Conductors </li></ul><ul><li>These materials allow electricity to flow easily. We use these materials in electrical circuits. </li></ul><ul><li>Insulators </li></ul><ul><li>Insulators don't allow electricity to flow easily and we use these materials to protect ourselves. </li></ul>Video
3. 3. Predict which items will conduct electricity
4. 4. Metals Non-Metals Conductors Insulators
5. 5. Check your predictions <ul><li>How will you know which items conduct electricity? </li></ul>
6. 6. Conductivity of different items <ul><li>Will the lamp light up when the circuit is switched on? </li></ul><ul><li>Metals conduct electricity. </li></ul><ul><li>Non-metals generally do not conduct electricity. </li></ul>
7. 7. Question: <ul><li>Is there anything in conductors and insulators which lets a current through? </li></ul><ul><li>In a conductor, electric current can flow freely, in an insulator it cannot. </li></ul>
8. 8. Why can metals conduct electricity?
9. 9. Varying resistance <ul><li>Resistance can be changed by altering the length or shape of a conductor, and also by changing the material itself. </li></ul><ul><li>Varying resistance turns out to be an amazingly useful thing to do. We can use it to control currents that in turn make things move faster, appear brighter, or sound louder. </li></ul>
10. 10. Exit Ticket <ul><li>Write an exit ticket explaining one way that what you learned today could help you in the real world. </li></ul>
11. 11. Resistance <ul><li>Learning Objective : </li></ul><ul><li>To describe the effect of resistance on current in a circuit. </li></ul>