Electricity Generation and Transmission

What are some renewable sources of energy?

• Coal and nuclear

• Solar panels and wind turbines

• Geothermal energy and tidal power

• Biomass and wave power

Which energy source is currently responsible for about 80% of the world's energy?

• Solar panels

• Wind turbines

• Fossil fuels

• Hydroelectric power

How is electricity generated in a fossil fuel power station?

• Coal is burned to heat water, which turns into steam and then generates electricity

• Solar panels convert sunlight directly into electricity

• Wind turbines harness the power of wind to generate electricity

• Nuclear reactions produce heat, which is used to generate electricity

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What is the purpose of a turbine in a power station?

• To burn fossil fuels

• To generate steam

• To turn a generator

• To reduce the voltage of electricity

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What is the function of transformers in the national grid?

• To increase the voltage and reduce the current

• To decrease the voltage and increase the current

• To convert electricity into different forms of energy

• To store excess electricity for later use

Why are step-up transformers used in power stations?

• To increase the voltage and reduce energy loss

• To decrease the voltage and increase energy efficiency

• To convert electricity into different forms of energy

• To store excess electricity for later use

What is the purpose of a step-down transformer?

• To increase the voltage and reduce energy loss

• To decrease the voltage and increase energy efficiency

• To convert electricity into different forms of energy

• To reduce the voltage to a safe level

What is the national grid?

• A system of cables and transformers linking power stations to consumers

• A device that generates electricity from renewable sources

• A network of power stations that generate electricity

• A method of storing excess electricity for later use

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Why does an electrical wire get hot when electricity flows through it?

• Because the wire is made of a material that heats up easily

• Because the wire is too thin and cannot handle the current

• Because some energy is lost as heat during the transfer of electricity

• Because the wire is not properly insulated

What is the main purpose of the national grid?

• To generate electricity from renewable sources

• To distribute electricity from power stations to consumers

• To store excess electricity for later use

• To convert electricity into different forms of energy