GCSE Physics - Plugs and Wires #22

The video tutorial explains the components and safety aspects of electrical wiring in the UK. It covers the National Grid's role in supplying electricity, the structure and function of a 3-core cable, and the specific roles of live, neutral, and earth wires. The tutorial emphasizes the importance of understanding potential differences and the safety measures provided by the earth wire to prevent electric shocks. It also highlights the risks associated with touching live wires and the necessity of adhering to safety precautions.

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

• 240 volts and 60 Hertz

• 230 volts and 50 Hertz

• 110 volts and 60 Hertz

• 220 volts and 50 Hertz

Which wire in a 3-core cable is responsible for carrying electricity into a device?

• Live wire

• Neutral wire

• Earth wire

• Ground wire

What is the color of the insulation on the neutral wire?

• Brown

• Red

• Green and yellow

• Blue

What is the primary role of the earth wire in electrical appliances?

• To increase the voltage

• To provide power to the device

• To prevent the appliance casing from becoming live

• To complete the circuit

Why is it dangerous to touch the live wire?

• It can cause a large current to flow through the body

• It has a potential difference of 0 volts

• It is always grounded

• It is insulated with plastic