The speed of fan is reduced by joining a variable resistance in series. If D.C. is used to move the fan, then

Options :
  1. the power used is same as on full speed of fan
  2. the more power is used than at the full speed of fan
  3. less power is used but efficiency of fan decreases
  4. less power is used and efficiency of fan is increased
Answer and Explanation :-

Answer: Option 3


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