A room heater is an example of a/an:

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A room heater is an example of a/an:

A. gear
B. robot
C. actuator
D. machine
Answer: D. machine
    An actuator is a component that produces motion or mechanical action (like motors, hydraulic cylinders, or solenoids). Actuators are typically used in control systems to move or adjust something physically.
    Electric heater’s role: It doesn’t produce motion or mechanical displacement; it simply generates heat. So, it doesn’t qualify as an actuator. A room heater converts electrical energy into heat energy to produce a physical effect (warming the room).