Transformers and the National Grid _ GCSE Physics

The video explains how the National Grid reduces energy loss by transmitting electricity at low current and high voltage. Transformers are used to adjust voltage levels, with step-up transformers increasing voltage for transmission and step-down transformers decreasing it for safe home use. The process ensures efficient electricity delivery from power stations to homes.

What happens to energy when a current flows through a wire?

• It is completely converted to light.

• Some of it is lost as heat.

• It remains unchanged.

• It is stored in the wire.

How does the National Grid minimize energy loss?

• By reducing the voltage.

• By using a low current and high voltage.

• By transmitting electricity at a high current.

• By using thicker wires.

What is the purpose of a step-up transformer?

• To increase the voltage.

• To store electricity.

• To convert AC to DC.

• To decrease the current.

Why is the voltage stepped down before electricity reaches homes?

• To store electricity in batteries.

• To make electricity visible.

• To prevent equipment from blowing up.

• To increase the speed of electricity.

What is the initial voltage of electricity produced at power stations?

• 10,000 volts

• 25,000 volts

• 50,000 volts

• 100,000 volts