Water heater is rated 1200w, 220v. Calculate
(i) it's resistance
(ii) the cost of operating 5 water heaters for 5 hours.(1kwh)=$34.00
(i) The resistance is
(ii) 5 heaters consume 5·1200=6000 W, or 6 kW. 1 kW costs $34, 6 kW cost 6·$34=$204.
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