When Is a Rheostat Used?

Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.

What devices use a rheostat?

Rheostats were often used as power control devices, for example to control light intensity (dimmer), speed of motors, heaters, and ovens.

Where is rheostat used in daily life?

For example, for high current circuits, large rheostats are used. They are also used in dimmer circuits, Speed control circuits for motors, heaters and ovens. Since they dissipate heat, they have low efficiency and hence are now being replaced by pulse width controlled switching devices.