Current is supplied to all but the starter circuit. Power is supplied to the ignition circuit and the starter motor only. That is why the radio stops playing in the start position. This position of the ignition switch is spring loaded so that the starter is not engaged while the engine is running. This position is used momentarily, just to activate the starter.
Power is supplied to all but the ignition and starter circuit.
This allows you to play the radio, work the power windows, etc. while the engine is not running. Most ignition switches are mounted on the steering column. This component also contains the mechanism to lock the steering wheel and shifter. The switch which contains the actual electrical circuits. It is usually mounted on top of the steering column just behind the dash and is connected to the lock by a linkage or rod.