Short circuits and earth wires
Lesson 5 / 8
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I can explain how electric circuits are wired in a home, with circuit breakers, fuses and earth wires for safety.
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A short circuit happens when a wire becomes loose and touches the wrong part of a circuit, or makes a new circuit.
If a live wire touches the inside of a metal case, the metal case may become live.
If there is too much current in an appliance, a fuse on the live wire in its plug melts and turns it off.
From a live metal case, current flows along an earth and live wire, melts a fuse and turns the electricity off.
Domestic circuits with excessive current are turned off by circuit breakers in a consumer box to prevent fire.
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