Mains Electricity and The National Grid - AQA Physics
Complete the questions below. Once finished, click view your score and see feedback/correct answers
Mains Electricity - You need to be able to:
• Recall the names of the three wires in a standard plug
• Recall information about mains electricity - including the voltage and frequency in the U.K
• Explain the difference between alternating and direct potential difference
Mains Voltage is at ....
Electrical appliances have a plug like this and use a three core cable.
What is the name of the wire connected to point 2?
What is the name of the wire connected to point 3?
What is the name of the wire connected to point 4?
Which statement is true about the live wire?
The live wire carries an alternating potential difference from the supply
The live wire carries a direct potential difference from the supply
What is the role of the earth wire?
To deliver electricity from the earth to an appliance
It is a safety wire to stop the appliance becoming live
It is a replacement wire that can be used if the live wire is not working
The National Grid - You need to be able to:
• Describe the National Grid - including the step-up and step-down transformers
• Explain why the National Grid is an efficient way of transferring energy.
The National Grid
Tick all of the true statements about the national grid
The National Grid is a system of cables and transformers linking power stations to consumers
Electrical power is transferred from power stations to consumers using the National Grid
The National Grid is only required during busy period
Step up and Step down transformers are used in the National Grid
The power supply needs to be maintained at 50Hz
A step-up transformer...
Increases the voltage in order to maximise the current in transmission wires
Increases the voltage in order to minimise the current in transmission wires
Decreases the voltage in order to maximise the current in transmission wires
Decreases the voltage in order to minimise the current in transmission wires
A step-down transformer...
Increases the voltage and the current
Increases the voltage and decreases the current
Decreases the voltage and the current
Decreases the voltage and increases the current
How is a power surge managed by the National Grid?
By limiting the amount of electricity that people can use at any one time
Co-ordinating when power stations are needed around the United Kingdom in order to meet demand
How confident are you with the topic on Mains electricity and the National Grid?
This form was created inside of Stoke Newington School and Sixth Form.
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