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# Power in the National Grid

New GCSE spec...
by

## Carl Bater

on 2 October 2018

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#### Transcript of Power in the National Grid

Power in the National Grid
If I gave you £150000, but took back £10, how would you feel?
What about if I gave you £100, and took back £10?
A typical Nuclear plant produces 350,000,000 Watts of electrical power at a voltage of 35,000 volts.
Use P = I x V to calculate the current this plant produces.

10,000 Amps...
A 350 km long power line will have a resistance of 275 Ohms.
Use P = I R to find how many Watts of energy would be wasted in this power line if we fed our 10,000 Amps into it.
2
27,500,000,000 Watts of wasted energy.
This is where transformers come in...
To reduce the wasted energy, we reduce the current and increase the voltage using a STEP UP transformer.
First, use P = I x V to find the current that would need to flow to move our 350,000,000 Watts of electrical energy at 437,500,000 Volts.

Then, use P = I R to find out how much energy would be wasted in sending this smaller current along our 275 Ohm power line.
0.8 Amps
2
176 Watts
This is quite obviously a HUGE energy saving.
Before some of this energy is used in the domestic supply, this huge voltage needs to be reduced by a STEP DOWN transformer.
Use P = V x I to find what current would flow out of a step down transformer that supplies 165,600 Watts of electrical energy to homes at 230 Volts.
720 Amps