There's an infinite amount. Never runs out. Solar - The sun must be out. Wind - Must be windy.
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How do solar panels work?
Silicon crystals absorb the energy from sunlight.Electrons are knocked out. Electrons move in one direction to produce a direct current.
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What is the position and maintenance of a solar panel?
Maximum sunlight (South facing). Clean surface. Remove leaves etc. so it doesn't cast a shadow.
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What does non-renewable mean?
Finite. Limit to the supply.
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How is power generated at a nuclear/coal power station?
Chemical/Nuclear energy used up to heat and boil water. Steam turns the turbine. This turns the generator that transfers the energy to electrical energy.
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How can you increase efficiency of a power station?
Use the heat from the steam to heat homes. This will reduce the need to burn fossil fuels to heat the homes.
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What is NEO action?
Constantly monitored by satellites, could be deflected by explosions.
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How was the moon formed?
Early earth and mars sized planets collided, molten iron formed in Earths core and debris formed into the moon.
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What is a comet?
Made of dust and frozen gas, speed up near the sun.
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What are asteroids?
Made of rocks, asteroid belt is between Mars and Jupiter.
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What was the Big Bang Theory?
Universe is expanding, evidence: the further away the galaxies move the more red the light is (red shift) and presence of CMBR.
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How do AC generators work?
Coil of wire spinning in a magnetic field. Generating more electricity - More coils/Stronger magnet / Spin faster.
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What are transformers?
No energy loss. Induced current . Ratio of coils - Step up voltage up, current down. Step down voltage down, current up.
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What is the national grid?
Network of electricity across uk. Voltage should be high so the current is low. This reduces energy loss as heat.
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What is the formula for power?
Power = Current x Voltage.
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Formula for paying for electricity?
P x T x Cost per kWh (give answer in pence unless asked to give in £)
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What are the unit scales?
Mega x 1000000 (6 0's) , Kilo x 1000 (3 0's).
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What is Alpha?
Highly ionising, stopped by paper. Smoke alarm - smoke blocks the alpha.
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What is beta?
Medium ionising. Stopped by aluminium. Paper thickness - paper absorbs SOME beta.
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What is Gamma?
Low ionising, reduced by lead. Medical tracers - can get out the body.
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How is nuclear waste disposed of?
Stored in (steel) drums or sealed in glass and buried deep underground for a long time.
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What is backround radiation?
Radiation is all around us from cosmic rays, radon gas and rocks.
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Other cards in this set
Card 2
Front
How do solar panels work?
Back
Silicon crystals absorb the energy from sunlight.Electrons are knocked out. Electrons move in one direction to produce a direct current.
Card 3
Front
What is the position and maintenance of a solar panel?
Back
Card 4
Front
What does non-renewable mean?
Back
Card 5
Front
How is power generated at a nuclear/coal power station?
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