There is no more electrical energy to power the lamp. Let’s change the circuit again and add a switch. A switch turns the circuit on or off by completing or breaking the circuit loop.

It’s useful to be able to turn an electrical circuit on or off by completing the loop or breaking the loop. We can do this by using a switch. A doorbell is a switch that completes a circuit when ...

Replacing a light switch is very easy. There are a few different kinds. Before installation, make sure to turn off the power.