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A power station delivers 630 kW of power at 12,000 Volt to a factory through wires with a total resistance of 5 ohms. Find how much less power is wasted if the electricity is delivered at 50,000 Volt rather than 12,000.

Find how many kWh of energy does a 600 Watt toaster use in the morning if it is in operation for a total of 19 minutes.

At a cost of 09 cents/kWh, compute how much this would add to your monthly electric bill if you made toast four mornings per week.

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Category:- Physics
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