P1.2

Question 1

Cost =

Answer 1

Number of kilowatt hours x cost per unit

Question 2

Cost
—————- =
Savings per year

Answer 2

Payback time (years)

Question 3

Energy can’t be…

Answer 3

Created or destroyed

Question 4

What do electricity costs depend on?

Answer 4

~ Amount of appliances used

~ Time appliances used for

Question 5

What are the 3 types of potential energy?

Answer 5

~ Chemical
~ Elastic
~ Gravitational

Question 6

What are the 7 types of energy?

Answer 6

Sound
Heat
Electrical 
Light
Potential
Nuclear 
Kinetic

Question 7

What energy do devices such as lightbulbs, kettles and TVs take in?

Answer 7

Electrical

Question 8

What energy does a TV produce?

Answer 8

~ Sound
~ Light
~ Heat

Question 9

How does double glazing reduce heat loss?

Answer 9

There is a vacuum between the glass which stops heat loss through convection

Question 10

Why is LED lighting efficient?

Answer 10

Produces the same amount of light brightness whilst using less electricity

Question 11

What is a virtual image?

Answer 11

The rays of light seem to come from it but do not pass through it