17. It is an abnormal connection between two nodes of an electric circuit intended to be at different voltages.

A. electric circuit

C. electric current

B. electric voltage

D. electric surge

18. It is an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.

A. electric circuit

B. electric voltage


C. electric current

D. electric surge

19. An automatically operated electrical switch designed to protect an electrical circuit from damage caused by an overload or short circuit.

A. electric panel

B. circuit breaker

C. direct current

D. alternating current​