Question

Define Internal energy.How it is related to the quantity of heat?

Answer 1

internal energy is the total sum of the heat energy and the other forms of energy in that body. it is related to the quantity of heat as internal energy increases making the heat energy increase also

Answer 2

Internal Energy-Energy possess by its system is known as it internal energy.

Relation between quantity of heat and internal energy is-

change in internal energy is the difference between amount of heat absorb and work done by the system

When work is done on the system then internal energy is equal to sum of heat absorb and work done on  the system