2.4.3 The National Grid

• The National Grid is a system of cables and transformers linking power stations to consumers.
• Electrical power is transferred from power stations to consumers using the National Grid.
• Step-up transformers are used to increase the potential difference from the power station to the transmission cables.
• Step-down transformers are used to decrease the potential difference to a much lower value for domestic use.
• Why is the National Grid efficient?

  Increasing the potential difference decreases the current, which decreases the energy lost by heating the wires and the surroundings.