National Grid & Transformers

 Why is the voltage increased in step up transformers in the national grid?

• To reduce the energy lost due to heating

• To increase the power

• To increase the current

 Why is the voltage decreased in step down transformers in the national grid?

• To reduce the energy lost due to heating

• It is safer for consumers

• Less energy is used by consumers

What is the approximate value of the potential difference of the UK mains electricity supply?

• 23

• 230

• 300

• 50

What does a step up transformer do?

• increase potential difference

• increase current

What does a step down transformer do?

• decrease potential difference

• decrease current

The National Grid distributes _____ across the country.