The variable resistor (rheostat) is a device to control the size of the current by adjusting the resistance on the variable resistor. Hence just device can be used to adjust the brightness of the bulb or the fan speed.
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The variable resistor (rheostat) is a device to control the size of the current by adjusting the resistance on the variable resistor. Hence just device can be used to adjust the brightness of the bulb or the fan speed.
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