The National Grid

Question 0

When electrical current passes down a wire, ‘The higher the current, the higher the…….’

Answer 0

Heat loss

Question 1

What is the National Grid and what does it provide?

Answer 1

The National Grid controls the electricity produced by large-scale power stations. It provides:

• A reliable, secure energy supply
• An electricity supply that matches the changing demand during the day and over the course of the year
• High voltage power lines that connect all the power stations to the consumer
• Electrical substations that control the voltage supplied to consumers

Question 2

What is a step-up transformer used for?

Answer 2

Increase voltage and decrease current, to reduce heat loss

Question 3

What is a step-down transformer used for?

Answer 3

Decrease voltage and increase current to a safe level suitable for the consumer

Question 4

What is the equation for power?

Answer 4

Electrical power= voltage x current

P= VI