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Question

What is the principle of Rheostat?


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Solution

  1. The principle of Rheostat is based on Ohm's law, which states that V=Ri, where V is the potential drop, i is the current and R is the resistance of wire.
  2. A rheostat is a circuit component that changes the resistance of a circuit.
  3. As the resistance in Rheostat increases, the current in circuit changes as value of R changes causing a change in i.
  4. Further the resistance of wire increases as the temperature increases.
  5. Rheostat is used as a variable resistance which controls current by increasing or decreasing the value of resistance

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