what is reostate..................................
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Variable resistance is called rehostate. It is a resistance box through which we can change resistance of circuit any time
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Rheostat is an adjustable or variable resistor. It is used to control the electrical resistance of a circuit without interrupting the flow of current. Rheostat has 3 terminals and usually consist of a resistive wire wrapped to form a toroid coil with a wiper that slides along the surface of the coil.
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