# Physics: Unit 1.3 and 4: Methods we use to generate electricity and the usefulness of electrical appliances

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• Created by: shcoool
• Created on: 25-05-15 19:10
What does the amount of energy transferred depend upon?
How long the appliance is swithced on and its power
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How do you calculate the amount of energy transferred?
E = P*t (energy is measured in kWh
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How is water used to produce energy?
Water is heated, and the steam produced drives a turbine which turns the electrical generator
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Give examples of energy sources that heat water
fossil fuels (coal, gas and oil), uranium and plutonium (energy from nuclear fission)O, biofuels
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How else may a turbine be driven?
water and wind directly - wind, waves, tides and hydroelectric power
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How else may electricity be produced?
the sun's radiation which solar cells convert
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What is geothermal energy?
Energy produced from the steam from the hot water is some volcanic areas
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Give examples of small-scale electricity production
HEP in mountainous areas and solar cells in road signs
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What are the effects of different energy sources?
the release of substances into the atmosphere, the production of waste materials, noise and visual pollution, the destruction of wildlife habitats
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What is the National Grid?
The network of cables and transformers used to transfer electricity from power stations to consumers
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How do you reduce the energy losses in cables?
By reducing the current - increasing the voltage for a given power
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What do step-up and step-down transformers do?
They change the voltage for cabels and homes
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## Other cards in this set

### Card 2

#### Front

How do you calculate the amount of energy transferred?

#### Back

E = P*t (energy is measured in kWh

### Card 3

#### Front

How is water used to produce energy?

### Card 4

#### Front

Give examples of energy sources that heat water

### Card 5

#### Front

How else may a turbine be driven?