Assertion and reason
A .A device called reostart is used in electrical circuits
R . In order to alter potential difference in circuits
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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.
The increase in current causes the potential difference across to increase. The potential difference will increase because the total resistance decreases, so the total current in the circuit increases. The increase in current causes the potential difference across to increase.
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