Keywords: Current, Energy, Power, Efficiency, Potential difference, Induction, P1 Topic 5/6: Generation and Transmission of Electricity and Energy and the Future This topic looks at: • How electricity is produced • How we calculate current, voltage and power • Conservation and the efficiency of energy use. Give an example of where you would use a Step up transformer. Give an example of where you would use a Step down transformer. Give an advantage and disadvantage of each of these electricity generation methods Fossil fuels A step down transformer converts the 240V mains supply to 12V to power a laptop computer. If there is 90 turns on the secondary coil, show that there needs to be 1800 turns on the primary coil. Nuclear power Identify the energy transfers at each stage What is the efficiency of this bulb? Wind and wave power Solar Hydroelectric Efficiency = Keywords: Transformer, Generator, Dynamo, Direct current, Alternating current, Step up, Step down.