P1 Topic 5: Generation & Transmission of Electricity

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What is current?
The rate of flow of charge
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What do electrons usually carry?
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What charge are electrons?
Negatively charged
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What is voltage (potential difference)?
An electrical pressuure giving a measure of the energy transferred
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What is alternating current (a.c)?
Current which changes direction every seconds
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What is direct current (d.c)?
Current which flows in one direction
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What is electrical power?
Energy transferred per second
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What are the units for power?
Watts (W)
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What does an ammeter measure?
Current flowing through the circuit
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In what kind of circuit will you find an ammeter?
Series (all in one loop)
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What does a voltmeter measure?
Voltage across the component
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In what kind of circuit will you find a voltmeter?
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What do you need to generate electricity?
A magnet; coil of wire
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To create more electrocity, what do you need?
More coils; stronger magnet; faster movement; larger surface area of coil
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What are the non-renewable energy resources?
Coal, natural gas, oil and nclear fuels
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What does burning coal and oil produce?
Sulfur dioxide (SO2)
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What can SO2 cause?
Acid rain
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What do all fossil fuels release?
Carbon dioxide (CO2)
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How are non-renewable resources converted into electricity?
Fuel is burnt -> water is heated into steam -> steam turns turbine -> turbine starts generator
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What are the energy transfers when converting non-renewable energy resources into electricity?
Chemical -> Heat -> Kinetic -> Electrical
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What are the three most common renewable resources?
Hydroelectric, solar panels; wind
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What does hydroelectric power usually involve?
Flooding a valley by building a big dam
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What is causght and allowed out through turbines?
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How does wind generate electricity?
Wind turbines move by the wind and this starts the generator
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Where is solar power often found in?
Remote places where there are not may other options to generate electricity
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What are transformers?
Change voltage size
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How does electricity reach the consumer?
Power stations -> Step up transformer -> step down transformer -> consumer
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What does a step up transformer do?
Increases voltage for efficient transmittion
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Does the step up transformer have more turns or the primary coil or secondary coil?
Secondary coil
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What does a step down transformer do?
Decreases voltage to safe, useable levels
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Does a step down transformer have more coils on the primary coil or secondary coil?
Primary coil
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Other cards in this set

Card 2


What do electrons usually carry?



Card 3


What charge are electrons?


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Card 4


What is voltage (potential difference)?


Preview of the front of card 4

Card 5


What is alternating current (a.c)?


Preview of the front of card 5
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