On the left: The conductor of a closed circuit becomes an electromagnet. Electromagnets can be used to produce movement. When the circuit is closed, the conductor's electromagnet will begin to move the permanent magnet attached to the toy car. On the right: Electronic locks are opened with electromagnets. When the button is pressed, the circuit becomes closed and the electromagnet releases the lock's clamp. This means that the door can be opened. When the button is not pressed, the metal spring returns the parts of the lock to their previous positions. This means that the door becomes locked.