Question 1
FThe Figure shows how electricity is transferred from a power station to homes by the national grid.
Figure
a.[1]
Name the type of transformer used at A.
b.[1]
What is the potential difference of the mains supply to homes in the UK?
Choose your answer from the list.
12 V 50 V 230 V 400 000 V400\ 000\ \text{V}400 000 V
c.[2]
Explain why electricity is transmitted through the transmission cables at a very high potential difference.
d.[1]
Suggest why transformer B is needed before the electricity reaches the homes.
8.2 Powering Earth Questions
16 exam-style questions on OCR GCSE Physics 8.2 Powering Earth, covering 8.2.1 Renewable and non-renewable energy resources, 8.2.2 Patterns and trends in energy use, 8.2.3 The national grid, 8.2.4 Step-up and step-down transformers, 8.2.5 Efficiency of the national grid, 8.2.6 Transformers and power transmission at high voltage, 8.2.7 The UK domestic supply, 8.2.8 Direct and alternating potential difference, 8.2.9 Live, neutral and earth wires, and 8.2.10 Dangers of mains electricity. Each one has a worked solution and a mark scheme showing where the marks go.