Which of the following is NOT based on the heating effect of current?

This question was previously asked in
RRC Group D Previous Paper 38 (Held On: 10 Oct 2018 Shift 2)
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  1. Electric heater
  2. Electric bulb (with filament)
  3. Electric iron 
  4. Microwave

Answer (Detailed Solution Below)

Option 4 : Microwave
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Detailed Solution

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The correct answer is the Microwave.

Key Points

  • A microwave oven uses microwaves to heat food.
  • In the case of microwave ovens, the commonly used radio wave frequency is roughly 2,500 megahertz (2.5 gigahertz).
  • Radio waves in this frequency range absorbed by water, fats, and sugars. When they are absorbed they are converted directly into atomic motion or vibration.
  • Therefore heavy motion or vibration is converted into heat.

Important Points

  • Microwaves are not absorbed by most plastics, glass, or ceramics.
  • The frequency of the Microwave equals the resonance frequency of water. Therefore foods could be heated up by the oscillation of water molecules.

Additional Information

  • An Electric heater, Electric blub (with filament), Electric iron is the electrical device that converts an electric current into heat.
  • They working on the principle of the Joule heating effect.
    • An electric current passing through a resistor will convert that electrical energy into heat energy.
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