# P3- Sustainable Energy OCR 21st century

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What equation links energy transferred, power and time?
Energy transferred = Power x Time
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What units are used in the energy transfer equation?
Joules/Kilowatt-Hours = Watts/Kilowatts x Seconds/Hours
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What equation is used to find the cost of eletrical appliances?
Cost = Number of kWh x Cost per kWh
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What is the formula for eletrical power?
Power (in W) = Voltage (in Volts) x Current (in Amps)
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How do you find the effciency of an object?
Useful energy transferred / Total energy supplied x 100%
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What is a sankey diagram?
A digram on energy
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Name a method of getting electricity without producing CO2 emmisions.
Nuclear energy/Wave power/Tidal Barrages/Geothermal energy/Hydroeletrcity
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What is the danger of Nuclear energy?
Nuclear radiation can escape and get into the human body causing cancer.
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Why are fossil fuels running out?
They are run out due to human usage as they are being used quicker than they can be made.
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What is the National Grid?
The National Grid is the network of pylons and cables that covers Britain
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## Other cards in this set

### Card 2

#### Front

What units are used in the energy transfer equation?

#### Back

Joules/Kilowatt-Hours = Watts/Kilowatts x Seconds/Hours

### Card 3

#### Front

What equation is used to find the cost of eletrical appliances?

### Card 4

#### Front

What is the formula for eletrical power?

### Card 5

#### Front

How do you find the effciency of an object?

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