Lesson Plan: P1.3.06

Hamble Lesson Observation Plan
Learning About
How is a plug supplied with electricity?
Keywords:
  • Transmit: cause (something) to pass on from one person or place to another. (1)
  • Transformer: An apparatus for reducing or increasing the voltage of an alternating current. (1)
  • Resistance: the degree to which a substance or device opposes the passage of an electric current, causing energy dissipation. (1)
  • National Grid: The network of high-voltage power lines that connect major power stations to consumers. (1)
Memory Anchor:
Method Precise Learning Objective Linked Question / Activity
(Designed for maximum working out)		 Stepping Stones Pitstop Check
(Thinking Map)
The National Grid is a system of cables and transformers linking power stations to consumers. What is the National Grid?

Model the National Grid to show how electricity is sent from power stations to consumers.
Electrical power is transferred from power stations to consumers using the National Orid. What is used to transfer electrical power from power stations to consumers?
Step-up transformers are used to increase the potential difference from the power station to the transmission cables Why are step-up transformers used in the National Grid?

Demo: How transformers affect potential difference http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/electric_circuits/mainsproducedrev5.shtml
Step-down transformers are used to decrease, to a much lower value, the potential difference for domestic use. Why are step-down transformers used in the National Grid?
Students should be able to explain why the National Grid system is an efficient way to transfer energy. Why is the National Grid system an efficient way to transfer energy?

Extended writing In the UK, electricity is delivered to consumers by the National Grid. Explain the main features of the National Grid.
Links To the Big Ideas
ForcesParticlesEnergyCells