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Power in the National Grid
Transcript of Power 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?