Electricity: Circuits and Energy

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Across
  1. 2. A resistor whose resistance can be changed.
  2. 7. A material that does not allow something to pass through it.
  3. 8. A piece of equipment that measures how much energy is being transferred by a current.
  4. 10. A component that can stop the flow of current.
  5. 11. A material that does not allow something to pass through it (e.g. heat, electricity).
  6. 13. Tiny particles that flow around a circuit.
  7. 15. The green and yellow wire in a cable or plug for safety.
  8. 17. A circuit with two or more branches that split apart and join up again.
  9. 20. A way of saying how much energy is transferred by electricity.
  10. 22. The blue wire in a cable or plug.
Down
  1. 1. A component that makes it difficult for electricity to flow.
  2. 3. A piece of wire that melts if too much electricity flows through it.
  3. 4. Substance that allows something to pass through it (e.g. heat, electricity).
  4. 5. The unit (V) for measuring voltage.
  5. 6. A measure of how difficult it is for electricity to flow through something.
  6. 9. The type of electricity used in houses.
  7. 12. A circuit in which there is only one loop of wire.
  8. 14. Circuit _______: safety device that switches off the electricity supply if the current is too big.
  9. 16. Something that could cause harm.
  10. 18. (fuse) The largest current a fuse can conduct without melting.
  11. 19. A good conductor of heat and electricity well.
  12. 21. The brown wire in a cable or plug.