Physics retry 2 0.0 / 5 ? PhysicsElectricityGCSEAQA Created by: IJM22Created on: 17-01-19 20:55 What does the National Grid consit of? System of transformers and high-voltage cables 1 of 7 Why is energy always lost in the power cables? Due to the resistance of the wires 2 of 7 How can we reduce the energy lost in the power cables? By building power stations near to homes 3 of 7 How can we reduce the energy lost in the power cables? By using transformers 4 of 7 How can using transformers help reduce the lost in the power cables? 1) Electricity passes throuugh step-up transformers which increase potential difference 2) the electricty then passes into step-down transformers 5 of 7 What happens to the energy when the potential difference is very high? Less energy is lost 6 of 7 What do step-down transformers do? Reduce the potential difference to around 230 Volts 7 of 7
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