Understanding Electrical Wires and Safety

What is the main topic of this video?

• Different types of electrical appliances

• Different wires in plugs and cables

• How to install a plug socket

• How to generate electricity at home

Where does the majority of electricity in the UK come from?

• Wind turbines

• Local power stations

• The national grid

• Solar panels

What is the voltage and frequency of the main supply in the UK?

• 240 volts and 50 hertz

• 220 volts and 60 hertz

• 230 volts and 50 hertz

• 110 volts and 60 hertz

What are the three wires found inside a three core cable?

• Hot wire, cold wire, and ground wire

• Positive wire, negative wire, and earth wire

• Live wire, neutral wire, and earth wire

• Live wire, neutral wire, and ground wire

What color is the live wire?

• Brown

• Green and yellow

• Blue

• Red

What is the role of the neutral wire?

• To stop the appliance casing from becoming live

• To provide an alternative pathway for the current

• To complete the circuit by carrying away current

• To provide the alternating potential difference

What is the potential difference of the neutral wire?

• 110 volts

• 230 volts

• 0 volts

• 50 volts

What is the purpose of the earth wire?

• To provide the alternating potential difference

• To provide power to the appliance

• To complete the circuit by carrying away current

• To stop the appliance casing from becoming live

Why is it dangerous to touch the live wire?

• It has a potential difference of 0 volts

• It can cause a large current to flow through you

• It is coated in insulating plastic

• It is connected to the earth wire

Why should you never touch plug sockets even if they are switched off?

• The socket can still generate electricity

• The earth wire still has a potential difference

• The live wire still has a potential difference

• The neutral wire still has a potential difference