The National Grid: Distribution of Electrical Energy in the UK

The video explains how electrical energy is distributed in the UK through the National Grid. It covers the role of power stations, step up and step down transformers, and the importance of high potential difference to reduce power loss. The National Grid uses a system of cables and transformers to efficiently deliver electricity to homes, businesses, and factories, minimizing resistive heating and power loss.

What is the primary function of a step-up transformer in the National Grid?

• To convert AC to DC

• To increase the potential difference

• To decrease the potential difference

• To store electrical energy

How does electricity travel across the UK in the National Grid?

• Using cables supported by pylons

• Through satellite communication

• Through underground tunnels

• Via wireless transmission

What is the role of a step-down transformer in the National Grid?

• To store excess electricity

• To convert electrical energy into mechanical energy

• To decrease the potential difference for homes and businesses

• To increase the potential difference for factories

Why does the National Grid operate at a high potential difference?

• To increase the current

• To reduce power loss due to resistive heating

• To make electricity travel faster

• To decrease the resistance of cables

What happens to power loss in a cable if the current is reduced?

• Power loss increases

• Power loss remains the same

• Power loss decreases

• Power loss becomes zero