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3. (a) What is a kilowatt-hour? (b) How many Joules of energy are contained in 1...

3. (a) What is a kilowatt-hour?

(b) How many Joules of energy are contained in 1 kWh?

(c) If the output power of a light bulb is 100 W. At 10 cents per kWh, what is the cost of running the bulb for 10 hours.

4. A 2 mm tungsten filament in a small light bulb has a resistance of 0.05 Ω. What is its diameter?

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