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Question

What is the rheostat?


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Solution

  1. Rheostat was first introduced by the English scientist Sir Charles Wheatstone.
  2. The word rheostat is derived from Greek word “rheos” and “-statis” which means a current controlling device.
  3. Rheostat is termed as a variable resistor which is used to control the flow of electric current in the electrical circuit by manually increasing or decreasing the resistance.
  4. It can be represented by two symbols:
  5. American Standard : The American standard symbol is represented by three terminals and zigzag lines.

6. International Standard: The international standard symbol is represented with a rectangular box with three terminals.


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