P3 - Sustainable Energy

Question 1

What two formulas could you use to calculate the efficiency of a hairdryer?

Answer 1

Efficiency = energy usefully transferred / total energy supplied * 100%

Question 2

What does a Sankey diagram show?

Answer 2

They are energy transformation diagrams that show how much of the I putted energy was used or wasted.

Question 3

How can energy be saved at home?

Answer 3

• double glazing
• loft insulation
• draught proofing

Question 4

How can energy be saved at work?

Answer 4

By commuting using public transport or cycling.

Not printing unnecessarily

Question 5

How can energy be saved on a national scale?

Answer 5

Governments can encourage energy saving.
They can give grants for better home insulation or trade old boilers for new, more efficient ones.
Also, they can invest in alternate energy sources, improve recycling services and make new laws about housing energy efficiency.

Question 6

What the difference between primary and secondary energy sources?

Answer 6

Primary - Produced without using any other energy sources

Secondary - Produced using other energy sources e.g coal

Question 7

Is electricity a primary or secondary energy source?

Answer 7

Secondary

Question 8

Describe the basic features of a thermal power station.

Answer 8

1) energy is released from the fuel and used to generate steam
2) the steam turns a turbine
3) a generator converts the movement of the turbine (kinetic energy) into electricity

Question 9

Name two sources of energy that power turbines directly without the use of steam.

Answer 9

Wind turbines

Solar power

Question 10

What equation links energy transferred, power and time?

Answer 10

Energy transferred = power * time