What is heat pump ? Name two electric appliances, which work as heat pump.

What is a heat pump ?

What is Na-K pump?

How do electric appliances work?

Name four appliances which work using electricity.

What is meant by pumping?

What is meant by the heating effect of current ? Name two appliances which work on the heating effect of current.

Explain a heat pump.

What are pumps ?

What are pumps ?