P1: Energy Efficiency

Question 1

Energy can be created and destroyed. True r false?

Answer 1

False. It can only be transformed into another form of energy.

Question 2

Efficiency=?

Answer 2

Useful energy transferred by the device/total energy supplied by device (x100)

Useful power/total power (x100)

Question 3

When energy is transferred or transformed, is it all usefully transferred/transformed?

Answer 3

No only part of it

Question 4

What is the energy called that is not usefully transferred/transformed?

Answer 4

Wasted

Question 5

Where do both useful and wasted energy end up?

Answer 5

They are eventually transferred into their surroundings which become warmer.

Question 6

Why does energy become increasingly more difficult to use for further energy transformation?

Answer 6

Because the energy becomes more spread out

Question 7

True or false, the greater the percentage of energy that is transferred in a device, the more efficient the device is

Answer 7

True

Question 8

What is a sankey diagram?

Answer 8

A diagram to show how much, and what type of energy is transferred