Energy efficiency

Question 1

What is energy efficiency?

Answer 1

Energy efficiency is the name which the energy that is actually used for the purpose of something is called.

Question 2

What table is used to show energy efficiency?

Answer 2

A Sankey diagram.

Question 3

What is the formula for figuring out how much energy is efficient?

Answer 3

Energy efficient/how much energy is given x100. E.G: a toaster, which gives out 1000 J, uses 250 J of energy for heat and the rest for light. So that would be 100(250/1000)= 25%

Question 4

How much energy is efficient?
A hairdryer has 500J, and uses 200J on blowing the air, 100J on heat and the rest on sound.

Answer 4

100(300/500)= 60%

Question 5

What part of a Sankey diagram is used to represent how much energy is wasted?

Answer 5

The arrow pointing down.

Question 6

If a string of fairy lights gives out 700 J, but uses 400 J on light and the rest on heat, how much is efficient?

Answer 6

100(400/700)= 57.1428.. (rounded up to 57.14)