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WJEC GCSE Science Double Award Electricity and the grid (Unit 3) overview quiz quiz

14questions. Pick an answer and you'll see why right away.

  1. What is the unit of electric current?

  2. A resistor has 12 V across it and 4 A through it. What is its resistance?

  3. How should a voltmeter be connected to measure the potential difference across a component?

  4. What does the current-voltage graph of a fixed resistor at constant temperature look like?

  5. In a series circuit, which quantity is the same at every point?

  6. Why are two identical lamps brighter in parallel than in series?

  7. What colour is the live wire in a UK plug?

  8. How do an earth wire and a fuse protect a user if the metal case becomes live?

  9. An appliance uses 230 V and 5 A. What is its power?

  10. When is a voltage induced in a coil?

  11. A transformer has more turns on the secondary coil than the primary. What does it do?

  12. Why must a transformer use alternating current?

  13. Why is electricity transmitted across the National Grid at high voltage?

  14. What does a step-down transformer do in the National Grid?