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Power in the National Grid

New GCSE spec...

Carl Bater

on 15 September 2011

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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 power station might produce electricity at around 30000 V. The problem is several hundred miles of power lines would waste thousands of volts of this energy as heat. SOLUTION: put a huge voltage along the power lines. A transformer that increases the voltage is called a STEP UP transformer A transformer that decreases the voltager is called a STEP DOWN transformer Current in the National Grid
Remember: POWER = CURRENT x VOLTAGE The power in the national grid is the SAME at all points.
This means that if the voltage goes up, the current goes down, and...
If the voltage goes down, the current goes up.
This is why high voltages waste very little energy - a small current hardly heats the wires up at all. Questions:
1: A power station produces a voltage of 25000 V at a power of 75000 W. Find the current flowing from the power station.

2: A step up transformer then increases the voltage to 350000 V. FInd the current flowing in the power lines.

3: Before reaching your house, a step down transformer reduces the voltage to 230 V. Find the current flowing in your house. How can we avoid wasting so much energy?
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