Physics - national grid
- Created by: cassiarh01
- Created on: 19-01-18 12:18
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- National grid
- Electricity production = energy demand
- Energy demand changes throughout the day.
- It increases when people get up in the am, come home from work and when it's dark or cold outside.
- Power stations run well below their max power output so they can cope with high demand when needed.
- Energy demand changes throughout the day.
- Uses a high pd and a low current
- High current - lose lots of energy as the wires heat up
- For a given power, increasing the pd decreases the current which decreases the energy lost by heating the wires
- This makes the National Grid an efficient way of transferring energy
- Potential difference
- Transformers step up the potential difference and then step it back down to safe, usable levels at the other end
- Potential difference is increased using a step up transformer, then using a step down transformer to reduce it
- Electricity production = energy demand
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