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1. A heater is designed to consume 1000 watts at 220 V. What current will it draw? If connected to a 110 V source, what will be the new power consumption and current?

2. If energy costs 8 cents per killowatt-hour, what will be the cost to run the heater in the previous problem at 220 V for a week?

3. It requires 3.35X10^{5} J to heat 1 litre of water from
20º
to the boiling point. If you heat the water in a 1000 W electric kettle which is 100% efficient:

(a) how long will it take to bring the water to the boiling point?

(b) at 8 cents per kW-hr, how much will it
cost?