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P2: Quiz 10 – Answers
P2: Quiz 10 – Answers
1)
a) Direct Current
b)
a) Direct Current
b)
2)
a) Alternating Current
b)
3)
a) AC or Alternating Current
b) 230 V
c) 50 Hz
4)
5)
a) Neutral (blue) goes left
b) Live (brown) goes right
c) Earth (striped) goes top
6)
a) The case of a plug is made from plastic or rubber because these materials are good electrical insulators
b) Fuses are there to protect the wiring of a device from a current that is too high
7)
a) The man has a potential difference of 0 V and the live wire has a potential difference of 230 V. This means that when the man touches the live wire, a large potential difference is produced between the live wire and the man, which will result in a current flowing through the man to earth. This will produce a large electric shock that can injure or kill the man
b) Yes. This is because the live wire will still have a potential difference even though there is no current flowing through the live wire as the device is switched off. So, when the man touches the live wire, a large potential difference is produced between the live wire and the man, which causes a current to pass through the man to earth
3)
a) AC or Alternating Current
b) 230 V
c) 50 Hz
4)
- Brown wire – live wire. The live wire alternates between a high positive and negative potential difference. The live wire has an alternating potential difference of around 230 V. The live wire is how the current enters a device.
- Blue wire – neutral wire. This wire completes the circuit. A current leaves an appliance through the neutral wire. The neutral wire has a potential difference of 0 V.
- Green & yellow wire – earth wire. The earth wire is there for safety and it provides a pathway for the current to flow away from a device to the ground if the device has a fault. This stops the appliance (usually the case) becoming live. Normally there is no current flowing through the earth wire; there will only be a current flowing through the earth wire when the device has a fault. The earth wire has a potential difference of 0 V.
5)
a) Neutral (blue) goes left
b) Live (brown) goes right
c) Earth (striped) goes top
6)
a) The case of a plug is made from plastic or rubber because these materials are good electrical insulators
b) Fuses are there to protect the wiring of a device from a current that is too high
7)
a) The man has a potential difference of 0 V and the live wire has a potential difference of 230 V. This means that when the man touches the live wire, a large potential difference is produced between the live wire and the man, which will result in a current flowing through the man to earth. This will produce a large electric shock that can injure or kill the man
b) Yes. This is because the live wire will still have a potential difference even though there is no current flowing through the live wire as the device is switched off. So, when the man touches the live wire, a large potential difference is produced between the live wire and the man, which causes a current to pass through the man to earth
Questions
Click here for a printable PDF of the graphs in this quiz.
1)
a) What does DC stand for?
b) Draw the voltage-time graph for a DC supply on the graph below.
Click here for a printable PDF of the graphs in this quiz.
1)
a) What does DC stand for?
b) Draw the voltage-time graph for a DC supply on the graph below.
2)
a) What does AC stand for?
b) Draw the voltage-time graph for an AC supply on the graph below.
2)
a) What does AC stand for?
b) Draw the voltage-time graph for an AC supply on the graph below.
3)
a) Is household mains electricity DC or AC?
b) What is the potential difference of household mains electricity?
c) What is the frequency of household mains electricity?
4) There are three different wires in a three-pin plug;
- a brown wire
- a blue wire
- a green & yellow
5) The diagram below shows a plug in black and white.
Give the name of the wire that goes to the…
a) left
b) right
c) top
6)
a) What material is the casing of the plug made from and why?
b) What is the role of a fuse in a plug?
7)
a) A man touches the live wire in a plug and experiences an electric shock. Explain why the man experiences an electric shock. Talk about the potential difference of the man and the live wire.
b) The wire/ plug/ socket is now turned off. Could the man still experience an electric shock if he touches the live wire? Explain your answer.
a) left
b) right
c) top
6)
a) What material is the casing of the plug made from and why?
b) What is the role of a fuse in a plug?
7)
a) A man touches the live wire in a plug and experiences an electric shock. Explain why the man experiences an electric shock. Talk about the potential difference of the man and the live wire.
b) The wire/ plug/ socket is now turned off. Could the man still experience an electric shock if he touches the live wire? Explain your answer.