Changing or replacing a light switch in your storage shed may be necessary if the existing switch goes bad or you want to install a different style of switch. Learning how to replace a switch is a simple storage shed or home improvement project that will save you the cost of hiring an electrician to do the work for you.
Single pole light switches are very simple circuits. They have 3 screw "terminals" on them.
The power comes into the switch and is either allowed to go out to the lights or stopped by the switch, depending on if the switch is on or off. It does not matter which terminal either of the power wires is connected to so you do not need to remember which wire is the power leg coming in or out when you take the switch off the wires and put the new one on.
Light Switch Wiring with power coming from the switch.
Light Switch Wiring with power coming from the light