Question

A particular household uses a 1.9 kW heater 2.1 h/day ("on" time), four 105 W lightbulbs 6.5 h/day , a 3.0 kW electric stove element for a total of 1.0 h/day, and miscellaneous power amounting to 2.0 kWh/day . If electricity costs $0.105 per kWh, what will be their monthly bill (30 d)? How much coal (which produces 7500 kcal/kg) must be burned by a 38 % -efficient power plant to provide the yearly needs of this household? Express your answer to two significant figures and include the appropriate units.

Answer 1

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