What is heat pump ?

What is Na-K pump?

Describe the working of a refrigerator as a heat pump . Derive an expression for its coefficient of performance.

An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m ?

What is heat engine ?

What is meant by Latent heat ?

What is heat? Which are the three modes of transfer of heat? Explain.

What is heat according to modern theory ?

What is heating effect of an electric current?

Answer in one sentence: What is the principle of heat exchange ?

What is meant by latent heat? How will the state of matter transform if latent heat is given off?