The switch is used to or an electrical circuit. When the switch is on, the circuit is , and when the switch is the circuit is open. Electrical current exists in the circuit when it is closed, but when it is open, there is no current in the circuit. The switch determines whether the circuit is open and closed

The switch is used to disconnect or connect an electrical circuit. When the switch is on, the circuit is complete, and when the switch is off, the circuit is open. Electrical current exists in the circuit when it is closed, but when it is open, there is no electrical current in the circuit. The switch determines whether the circuit is open and closed.

1 a

2 d

3 a

4 c

explanation: