P1.4 0.0 / 5 ? PhysicsP1.4GCSEAQA Created by: elisha.ksCreated on: 11-03-17 13:49 what does the national grid do takes electrical energy from power stations to where it's needed in homes/industry 1 of 18 what does it enable power to be generated anywhere on the grid, and then be supplied anywhere else on the grid 2 of 18 what do you need to transmit large amounts of power either a high voltage or a high current 3 of 18 what's the problem with high current you lose lots of energy through heat in the cables 4 of 18 what's it much cheaper to do boost the voltage up really high (400,000V) and keep the current really low 5 of 18 what does this require transformers and big pylons with huge insulators (but is still cheaper) 6 of 18 what do the transformers have to do step voltage up at one end, for efficient transmission, then bring it back down to safe, usable levels at the other end 7 of 18 how is the voltage increased stepped up using a step-up transformer 8 of 18 how is the voltage reduced stepped down at the consumer end using a step-down transformer 9 of 18 what are the two ways to transmit electricity underground cables or overhead power lines 10 of 18 advantages of overhead cables lower setup cost, faults easy to access, easy to set up, minimal disturbance to land 11 of 18 disadvantages of overhead cables lots of maintenance, looks ugly, affected by weather, less reliable 12 of 18 advantages of underground minimal maintenance, better look (hidden), not affected by weather, more reliable 13 of 18 disadvantages of underground higher set up cost, faults hard to access, hard to set up, lots disturbance to land 14 of 18 what does the national grid need to do generate and direct all the energy that the country needs, and our demands keep increasing 15 of 18 how will increased demands in the future be met energy supplied to national grid will have to increase, or the energy demands of consumers will need to decrease 16 of 18 how can supply be increased in the future opening more power plants, or increasing their power output, or both 17 of 18 how can demand be reduced consumers using more energy-efficient appliances and being more careful to not waste energy in the home 18 of 18
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