Understanding Electrical Wires in Plugs and Cables

This video explains the different wires found in plugs and cables, focusing on the live, neutral, and earth wires. It highlights the importance of understanding their roles and the risks of electric shock. The UK's main electricity supply is described as an alternating current of 230 volts at 50 hertz. The video emphasizes the safety mechanisms provided by the earth wire to prevent electric shocks and the importance of not touching plug sockets.

What is the main topic discussed in this video?

• Different types of electrical appliances

• History of electricity

• Different wires in plugs and cables

• How to install electrical wiring

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

• Local power stations

• National grid

• Solar panels

• Private generators

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

• 110 volts and 60 hertz

• 230 volts and 50 hertz

• 240 volts and 50 hertz

• 220 volts and 60 hertz

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

• Live, neutral, and ground

• Live, neutral, and earth

• Positive, negative, and ground

• Positive, negative, and earth

What color is the live wire?

• Red

• Brown

• Green and yellow

• Blue

What is the function of the neutral wire?

• To provide the alternating potential difference

• To stop the appliance casing from becoming live

• To provide an alternative pathway for the current

• To complete the circuit by carrying away current

What is the potential difference of the neutral wire?

• 110 volts

• Zero volts

• 230 volts

• 50 volts

What is the role of the earth wire?

• To provide the alternating potential difference

• To stop the appliance casing from becoming live

• To complete the circuit by carrying away current

• To provide power to the appliance

Why is it dangerous to touch the live wire?

• It is insulated with plastic

• It is always switched off

• It can cause a large current to flow through us

• It has a potential difference of zero volts

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

• They are always live

• They can still have a potential difference

• They might be dirty

• They are made of metal