One way to eliminate lights being left on when either they are not needed or when no one is in a room is to install a __________ to turn lights on and off automatically.
A) motion detector
B) dimmer switch
C) photo cell
D) double-pole switch

Question

Quizplus · Accepted Answer

A motion detector is the best choice as it will detect when someone enters or leaves a room and turn the lights on or off accordingly, ensuring that lights are only on when they are needed. Dimmer switches allow the user to adjust the brightness of the lights but do not turn them off automatically. Photo cells can detect changes in natural light and adjust lighting levels accordingly, but do not turn the lights off when no one is in the room. Double-pole switches control power to two separate circuits and are not designed to automatically turn lights on or off.

One Way to Eliminate Lights Being Left on When Either