Electrical Energy Transmission and Consumer Safety

The video tutorial explains the process of power transmission from power stations to consumers via the National Grid, highlighting the role of transformers and transmission cables. It discusses the importance of stepping up potential difference to reduce current and improve efficiency. The tutorial also covers the differences between direct and alternating potential differences, emphasizing the use of AC in the UK. Additionally, it details home wiring systems, including the roles of neutral, live, and earth wires, and safety measures to prevent electric shocks.

Why is the potential difference stepped up at the power station?

• To match the potential difference used by appliances

• To make the electricity safer for consumers

• To reduce energy loss as heat in the cables

• To increase the current in the transmission cables

What is the main characteristic of alternating current (AC)?

• It is used only in batteries

• It reverses direction periodically

• It flows in one direction only

• It has a constant potential difference

In the UK, what is the frequency of the alternating current supplied to homes?

• 30 Hertz

• 50 Hertz

• 60 Hertz

• 40 Hertz

What is the purpose of the earth wire in home appliances?

• To increase the appliance's efficiency

• To prevent electric shocks by grounding faults

• To provide a backup power source

• To carry the main current

What happens when a live wire touches the metal case of an appliance?

• The potential difference increases

• The appliance stops working

• The circuit is completed, causing a potential electric shock

• The appliance becomes more efficient