Why won't one of the lights go on?
The wires are connected incorrectly on the third bulb.
Why won't the motors turn on in the circuit?
The switch is open.
Why won't one of the speakers play music?
The speaker is wired incorrectly. The circuit is incomplete.
Why won't the doorbell ring?
The switch is not connected properly.
Why won't the fan in the hair dryer move?
The switch is in the off position.
Why won't the bulbs light up?
The wire is not connected to the battery.
Why won't this flashlight turn on?
Battery poles are reversed.