Across
- 2. Generating a current in a wire by moving the wire in a magnetic field, or by moving a magnet inside a coil of wire.
- 5. A length of wire that heats up and melts (‘blows’) if the current is too large, and so cuts off the electrical supply.
- 6. A transformer that decreases the voltage of alternating current.
- 11. Energy that spreads out into its surroundings so that it is no longer useful.
- 14. The energy going into a device.
- 15. An electromagnetic device that cuts off the electrical supply, if the current is too large.
- 17. The process of changing energy from one form into another.
- 18. This safety wire connects the metal case of an appliance to the earth.
- 20. A device that increases or decreases the voltage of alternating current.
- 21. The unit of power. 1 watt = 1 joule of energy transferred every second.
Down
- 1. The domestic electrical power supply with a voltage of 230 V.
- 3. A transformer that increases the voltage of alternating current.
- 4. A place where the high voltage electricity from the national grid is reduced by transformers so that it can be used in homes.
- 7. A measure of how good a device is at changing energy from one form to another.
- 8. The forms of energy produced by a device.
- 9. The network of high-voltage power lines that carries electricity from power stations across the country.
- 10. A current that constantly changes direction. It is produced by most electrical generators.
- 11. A current that always flows in the same direction. It is produced by cells and batteries.
- 12. The rate at which energy is transferred.
- 13. Energy in a form that is not wanted or is not used.
- 16. Energy in a form that is wanted.
- 19. A machine that converts kinetic energy into electrical energy by induction.