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Presentation transcript:

Images

A standard UK three-pin plug

A standard UK three-pin plug

Krasowit/Shutterstock, Jorge Farres Sanchez/Dreamstime A 3-core and a 2-core wire. Both contain a live and a neutral wire, but only the 3-core has an earth wire.

oksana2010/Shutterstock Fuses usually come as replaceable cartridges. The wire inside the fuse heats up and melts if there is too much current.

David J. Green/Alamy Some appliances are double-insulated, as indicated by the square symbol in the photo. They do not need an earth wire as the case cannot become live.