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Give an advantage of a photocell
They do not pollute the atmosphere
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Give a disadvantage of a photocell
They only work during the day or when there's sunlight
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Explain what passive solar heating is
This is where glass traps energy from the sun but doesn't distribute the energy or change it into another form
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What kind of electricity does a photocell produce?
DC
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What is the difference between AC and DC
AC alternates the current where as DC is constant
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How does a solar stove work?
Sunlight is converted to heat energy that is retained for cooking.
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How do you make an AC generator produce a bigger current?
Use stronger magnets, use more turns in the coil, move the coil faster or move the magnet faster
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List three fossil fuels
Crude oil, coal, natural gas
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Give one advantage of using fossil fuels
They are relatively cheap and easy to obtain
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Give one disadvantage of using fossil fuels
Burning then produces CO2 which causes global warming, and SO2 which causes acid rain
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What does carbon neutral mean?
Fuels release only as much carbon dioxide when they burn as was used to make the original oil by photosynthesis.
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Give one advantage of using wind turbines
They produce clean electricity
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Give one disadvantage of using wind turbines
They take up lots of space and are unsightly
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What does AC mean?
Alternating current
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What is the national grid?
A network that carries electricity from power stations across the country.
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What is the formula for power?
Power = Current X Voltage
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What is UK mains voltage?
230V
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What does 50Hz mean?
50 waves are passing through a point each second
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What is a kilowatt hour?
A measure of how much electrical energy has been produced
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What is the formula for efficiency?
total input/total output X 100
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Name three greenhouse gases
Carbon dioxide, water vapour and methane
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List three forms of biofuels
Wood, straw and manure
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Name a nuclear fuel
Uranium
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What are the three types of radioactivity?
Alpha, beta and gamma
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What stops alpha?
Paper
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What stops beta?
3-5mm of aluminium
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What stops gamma?
A thick sheet of lead
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What force keeps the Earth orbiting the Sun?
Its gravitational force
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What is the difference between asteroids and comets?
Asteroids are rocks that are left over from the formation of the solar system, but a comet is a small body with a core of frozen gas and dust
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Give two examples of medical uses of gamma rays
Cancer treatment and to sterilise medical treatment
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What precautions should we take when handling radioactive material?
Wear protective clothing, keep a distance from the source, try to minimise exposure time and store the materials in a clearly labelled, shielded containers.
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How do we think the universe began?
Billions of years ago in a big explosion
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What did Ptolemy think the universe was like?
The Earth was in the centre and was surrounded by crystal spheres that held the other planets and stars
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Who proved Ptolemy wrong?
Copernicus and Galilei
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Other cards in this set

Card 2

Front

Give a disadvantage of a photocell

Back

They only work during the day or when there's sunlight

Card 3

Front

Explain what passive solar heating is

Back

Preview of the front of card 3

Card 4

Front

What kind of electricity does a photocell produce?

Back

Preview of the front of card 4

Card 5

Front

What is the difference between AC and DC

Back

Preview of the front of card 5
View more cards

Comments

panna

this is very usefull

PickleBarrel

Doesn't specify what kind of power formula

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