Physics
Grade-7
Easy

Question

Which one of the following devices is not based on the heating effect of electric current?

  1. Geyser
  2. Toaster
  3. Grinder
  4. Heater

hintHint:

Grinder

The correct answer is: Grinder


    The Blades of the grinder are essentially connected to a motor which rotates. The energy required to rotate the motor is electrical energy and the motion of the motor corresponds to the production of mechanical energy not heat energy.

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