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Transcript
Transmission of Electricity Learning Outcomes • Explain in terms of energy efficiency and safety, why electricity is transmitted at high voltages but used at low voltages. • Investigate the operation of ‘step up’ and ‘step down’ transformers. Physics 1 GCSE Science A • Select and use the equation Power = Voltage x Current (P=V x I) Transmission of Electricity Key Words: Physics 1 GCSE Science A • Power: The rate of flow of energy Transmission of Electricity Physics 1 GCSE Science A What do you remember from last lesson? Transmission of Electricity Power = Voltage x Current When we send electricity through a step up transformer, it increases the voltage and decreases the current This means that the power always stays the same Physics 1 GCSE Science A We want to send electricity at as low a current as possible because this means less energy will be lost in the power lines as heat. Power (Watts) Voltage (Volts) Current (Amps) 6 6 1 6 3 2 6 2 3 6 1 6 6 0.5 12 Transmission of Electricity Why do we need step down transformers? Step down transformers lower the voltage and raise the current (the power stays the same) Physics 1 GCSE Science A We need to use low voltages for safety! Click this... Physics 1 GCSE Science A Transmission of Electricity Transmission of Electricity Power = Voltage x Current Physics 1 GCSE Science A P=VxI P = V x I V=P I I=P V Transmission of Electricity Physics 1 GCSE Science A Example 1: My laptop has a power rating of 76W, it uses 4A of current. What Voltage does my laptop require? Transmission of Electricity Physics 1 GCSE Science A Example 2: The average home uses around 1000W of electricity. Houses use electricity at 240V. What is the current used by the house? Transmission of Electricity Today, you guys are going to be the teachers. A select few of you will come to the front, sum up the lesson, and then question the class! Physics 1 GCSE Science A Who’s brave enough to take up the challenge?