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Across 4. A strip of metal, going from the highest point of a building to the ground, that prevents lightning from damaging the building by taking the electricity to the ground before it can reach a dangerous level. 8. A small safety part in an electrical device or piece of machinery that causes it to stop working if the electric current is too high, and so prevents fires or other dangers. 10. A component in an electric or electronic circuit which possesses inductance. 11. A closed system of wires or pipes through which electricity or liquid can flow. 12. A piece of equipment, used especially in the past, for directing all the phone calls made to and from a particular building or area. 14. A machine that produces electrical power.

Down 1. A piece of thin metal thread with a layer of plastic around it, used for carrying electric current. 2. A safety device that stops the flow of current in an electrical circuit when there is a fault. 3. A piece of electrical equipment that changes the force of an electrical current. 5. A movement of water, air, or electricity in a particular direction. 6. A small device, usually pushed up or down with your finger, that turns on or off an lamp, for example. 7. To put too much electricity through an electrical system. 9. An electronic device that measures voltage, current, and resistance. 12. The part of a piece of equipment, especially electrical equipment, into which another part fits. 13. A piece of equipment that stays attached to a house or other building.