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A switch is used to connect or disconnect a load from a source of voltage. If you take the input and connect directly to the output the result is that the connected device is always on.
Switch
this is a circuit in which the switch is located before the load in the circuit
To control a light with a switch, the switch has to be connected in series with the light fixture.
Switch
When the switch is open, the circuit is not a complete circuit. Electricity needs a complete circuit of conductive material. The switch breaks the circuit causing the flow of electricity to be disrupted. When you close the switch, a full circuit is restored thus restoring the flow of electricity.
Battery, bulb, switch and conductors that connect everything together.
In a circuit, the purpose of a switch is to control the current flow to the load by opening the circuit (off) or closing the circuit (on). When the circuit is open, the is no complete loop through which the current can flow. When the switch closes the circuit, it restores the loop, and thus allows the current to flow.
To keep a radio of any kind from dropping memory you'll need to connect the clock circuit to a wire that is hot (energized) at all times. I you have a two way radio you'd need to connect it to a hot circuit, but i'd install a switch to shut it off when you arent in the car.
Yes.
a switch
http://www.kpsec.freeuk.com/seriespa.htm