Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What is the National Grid?
   • The National Grid is a system of cables and transformers linking power stations to consumers.
2. What is used to transfer electrical power from power stations to consumers?
   • Electrical power is transferred from power stations to consumers using the National Grid.
3. Why are step-up transformers used in the National Grid?
   • Step-up transformers are used to increase the potential difference from the power station to the transmission cables.
4. Why are step-down transformers used in the National Grid?
   • Step-down transformers are used to decrease, to a much lower value, the potential difference for domestic use.
5. Why is the National Grid system an efficient way to transfer energy?
   • The National Grid system is an efficient way to transfer Energy because is transmits electricity at a low current to reduce Energy lost as heat. This requires a high voltage. This is achieved by using a step-up transformer.