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Flip the switch from off to on.
You can make music come on with a light switch the same way you can make a light bulb come on - plug a radio into the switched outlet.
a light switch
An old/worn/faulty light switch, or the wires connected to the switch are loose. Replace the switch ASAP.
The simple machine in a light switch is a "lever".
Check the petal and make sure that the plastic part that touches the brake light switch when the petal is in contact with the brake light switch is still on the petal, if it is missing you will need to replace it, so the petal will make correct contact with the brake light switch.
You can use a 12volt car coil.
In the kitchen, turning the light on when we walk in.
A lever.
switch lights off
.
In a theoretical ciucuit, a switch is not essential. What is needed is a source of electricity.