Year 7 Energy

Question 1

What is the diagram used to represent energy efficiency?

Answer 1

Sankey diagram

Question 2

How can you calculate the efficiency of a device?

Answer 2

Useful energy transferred by the device (output) divided by total energy supplied (input)

Question 3

What is the law of conservation of energy?

Answer 3

Energy is never created or destroyed, only transferred from one form to another

Question 4

List the types of energy and a way to remember them

Answer 4

Magnetic, kinetic, heat, light, gravitational potential, chemical, sound, elastic potential, electrical, nuclear

(Most Kids Hate Learning GCSE Energy Names)

Question 5

List the energy transfers in a newtons cradle

Answer 5

Chemical energy is converted into kinetic energy in the hand of the person starting it off. Kinetic energy is transferred into gravitational potential energy as the ball rises. As the ball falls the gravitational potential energy is converted back into kinetic energy