Question

give the meaning of short circuit and overloading in an electric circuit

Answer 1

an electrical circuit in a device of lower resistance

Answer 2

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Electrical circuits are designed to handle a limited amount of electricity. An overload occurs when you draw more electricity than a circuit can safely handle. If there were no breaker in the circuit, an overload would cause the circuit wiring to overheat, which could melt the wire insulation and lead to a fire.