The SI unit of heat energy transferred is expressed in ______.

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RRB ALP Electrician 22 Jan 2019 Official Paper (Shift 3)
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  1. Amperes
  2. Joule
  3. Kilowatt
  4. Kelvin

Answer (Detailed Solution Below)

Option 2 : Joule
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Detailed Solution

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The correct answer is Joule.

Key Points

  • Heat
    • It is a form of energy that flows from one body to another due to the difference in temperature between the bodies.
    • It is simply the potential energy stored in the bonds that hold particles within the object together.
    • Heat or thermal energy is the form this energy possesses when it is transferred between systems and surroundings.
    • SI unit of energy is Joule (J) and from above it is clear that heat is a form of energy.
    • Therefore the SI unit of heat energy is Joule (J).

Additional Information

  • SI unit of other quantities is as shown below 
Quantity  SI unit  Formula
Resistance  Ohm
Charge Coulomb -
Power  Watt P = Work/time
Current  Ampere I = Q/t
Temperature Kelvin  

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