Question

1. In any electrical circuit when the open switch is on and the current flows through it
why do the wire, switches, bulb or devices become hot?​

Answer 1

A switch is a simple device that either breaks the circuit or completes it. If the switch is “ON” then the current flows through the circuit and when the switch is “OFF” then the current cannot flow through the circuit.

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Answer 2

Answer:

because of heating effect of electric current.