electricity

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Give two advantages of geothermal energy
No pollution and low running costs
1 of 9
What is the job of a step-down transformer?
It decreases the voltage from 400,000 V to 230 V
2 of 9
What power station has the shortest start-up time?
Gas power station
3 of 9
How are biofuels produced?
From plant and waste
4 of 9
Describe how tidal power is formed
Moon's gravity raises tides,caught in reservoir behind dam, runs out,turns turbine, turns generator and electricity is produced.
5 of 9
A double glazed window costs £200. It saves £10 per year on the fuel. Calculate the payback time
payback time=20 years
6 of 9
Jan works out the efficiency of one of the windmills. The energy of the air hitting the blades of the windmills is 20 000 J each second. The energy transferred to the power lines is 5000 J each second. Calculate the efficiency of the windmill.
25%. 5000/20,000
7 of 9
Complete the sentence to show the energy transfer taking place in the wind powered generator ........... Energy is transferred to ............energy.
kinetic-movement;electrical
8 of 9
What are the two units of energy?
Joules and killowatt hours
9 of 9

Other cards in this set

Card 2

Front

What is the job of a step-down transformer?

Back

It decreases the voltage from 400,000 V to 230 V

Card 3

Front

What power station has the shortest start-up time?

Back

Preview of the front of card 3

Card 4

Front

How are biofuels produced?

Back

Preview of the front of card 4

Card 5

Front

Describe how tidal power is formed

Back

Preview of the front of card 5
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