The correct answer is: A. motors
Delay fuses are used to protect motors from overloads. They are designed to allow a motor to start up and run for a short period of time even if there is a slight overload. However, if the overload continues, the fuse will blow and protect the motor from damage.
Option B: Power outlet circuits are protected by circuit breakers, not fuses. Circuit breakers are designed to shut off the power to a circuit if there is a short circuit or an overload.
Option C: Fluorescent lamps are protected by ballasts, not fuses. Ballasts are devices that provide the high voltage needed to start fluorescent lamps. They also regulate the current flow to the lamps and prevent them from overheating.
Option D: Light circuits are protected by circuit breakers, not fuses. Circuit breakers are designed to shut off the power to a circuit if there is a short circuit or an overload.