Efficiency

Question 1

What is weight measured in?

Answer 1

Newtons (N)

Question 2

What is energy measured in?

Answer 2

Joules (J)

Question 3

What happened to your muscles when you waste energy?

Answer 3

They get warmer

Question 4

What two types of energy comes out of a sankey diagram?

Answer 4

Energy wasted

Useful energy

Question 5

What does a sankey diagram show?

Answer 5

It shows how we can represent any energy transfer where energy is wasted

Question 6

Can energy be created or destroyed?

Answer 6

Neither

Question 7

What is the equation for a sankey diagram?

Answer 7

Energy supplies = useful emery delivered + energy wasted

Question 8

What is the equation for any device that transfers energy?

Answer 8

Efficiency = useful energy transferred by the device/ total energy supplied to the device

Question 9

What does wasted energy cause?

Answer 9

Inefficiency

Question 10

What happened to your muscle when you lift an object?

Answer 10

The useful energy from your muscle goes to the object as gravitational potential energy