Question

a rheostart is used.......

Answer 1

Answer:

rheostat is used to increase or decrease resistance of the conductor

that's why it is also called variable resistance

Answer 2

Answer:

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.

rheostat is a variable resistor which is used to control current. they are able to vary the resistance in circuit without interruption. the construction of a rheostat is very similar to potentiometer