Thermodynamics - Reverse Heat Engines

Question 1

What does a fridge do

Answer 1

Extract as much energy from the cold region as possible for each joule of work done

Question 2

What does a heat pump do

Answer 2

Transfer as much energy to the hot region as possible for each joule of work done

Question 3

Define coefficient of performance

Answer 3

A measure of how effective a reversed heat engine is at transferring heat per unit of work done