Question

What is SI unit of heat energy?
(A). Joule
(B). Calorie
(C). Kg
(D). Ampere

Answer 1

Hint: Heat energy is also a form of energy so it will have the same units as that of energy.

Complete step-by-step solution -

According to the International system of units (SI), Heat energy is measured in Joules(J).
1 Joule is defined as the amount of energy exerted or work done when a force of one newton is applied over one meter distance.
Heat energy is defined as a form of energy that flows from a body at a higher temperature to a body at a comparatively low temperature. At atomic levels it is seen in the form of vibrations and it is normally called thermal energy. The atoms vibrating with a higher speed have more thermal energy than the ones with slower vibrations. In thermodynamics we can say that thermal energy transfers from hot body to a cold body by means of Kinetic energy.
The correct answer is Joule.

Additional Information:
Heat energy can be calculated by using the formula:
$q=mC\mathrm{\Delta }T$
Where q gives the heat energy
 m is mass of the body
C is specific heat constant
and $\mathrm{\Delta }T$ is the change in temperature

Note: A common mistake could be that Calorie is often used as a unit for heat energy, but it is not the SI unit. One calorie is defined as the amount of energy required to raise the temperature of the body by 1 degree Celsius.