What happens to the current in a circuit when you close the switch?

Current flows

Explanation:

When a circuit is closed, its is said to be complete and current flows through easily without any break.

When a circuit is open at the switch, current will not flow through and the circuit is broken.

An evidence of complete circuit is seen when the bulb is powered or other electrical appliances begins to function.

Current flows in a close path as the negative charges are drawn by the positive charge at the other end.