Physics - Current Electricity Question with Solution | TestHub

When an electrical appliance is switched on, the electrons in the conducting wires move with their drift speed which is very less than the speed of light. But as soon as the switch is on, an electromagnetic wave is set up inside, the conductor and the electrical signal is carried by them. The speed of electromagnetic wave is, of course, equal to the speed of light and hence the appliance, responds almost immediately after the switch is made on.