Electricity and the national grid
- Created by: jaaaz_v
- Created on: 10-06-15 11:55
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- Electricity and the National Grid
- The national grid takes energy from power stations to where its needed (homes and industries)
- Power can be generated anywhere on the grid, and supplied to anywhere else on the grid
- The national grid needs to transmit huge amounts of power
- Either with a high voltage or high current
- Too much energy is lost as heat using high currents
- Cheaper to increase the voltage and keep the current low
- Transformers and pylons help to keep the voltage high
- Transformers step the voltage up at one end and step it down at the other end
- Step-up transformer to increase the voltage for efficient transmission
- Step-down transformer to reduce the voltage so its safe and at usable levels
- Overhead cables
- Step up cost is lower
- Lots of maintenance needed
- Easy to access faults
- Looks ugly and is effected by weather
- Minimal disturbance to land and easy to sett up
- Underground cables
- Set up costs are high
- Minimal maintenance
- Hard to access faults
- Not affected by weather and is hidden
- Hard to set up and lots of disturbance to lans
- Supply and demand
- National grid needs to supply and generate all of the energy we need
- Our energy demands keep increasing
- National grid will need to increase energy supplied or we will need to decrease our energy demands
- Supply can be increased by opening more power plants
- Demand can be reduced by us using more energy efficient appliances
- The national grid takes energy from power stations to where its needed (homes and industries)
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