Transfer of energy

Question 1

Describe what happens when a system changes

Answer 1

When a system changes energy is transferred. It can be transferred into or away from the system, between different objects in a system or between two different types of energy stores

Question 2

Describe how energy can be transferred by heating

Answer 2

For example, boiling water in a kettle
Energy is transferred to the water by heating, into the water’s thermal energy store (causing the temperature of the water to rise)

Question 3

Describe how energy can be transferred by Doing Work

Answer 3

Work can be done when current flows. For example work is done against resistance in a circuit or by a force moving an object

Question 4

Give an example of energy being transferred by Doing Work

Answer 4

The initial force exerted by a person to throw a ball upwards does work. It causes energy transfer from the chemical energy store of the person’s arm to the kinetic energy store of the ball and arm