Problem Solving engineering?

Question

If electricity costs .07 dollars/ kWh (kilowatt-hour), how much money does a typical household spend for electricity each year if the average continous home electricity is approximately 1 kW?

Answer 1

One year = 365.25 days * 24hours/day = 8,766 hours.

Cost per hour  = 1kw * 0.07 $/kwh = 0.07 $/h.

Total cost per year = 8,766 h *  0.07 $/h = 613.62 $

Answer 2

If a houshold uses 1 kW continuously througout the year just do it by unit analysis

1 kW x 1 yr x 365 days/yr x 24 hr/day = 8,760 kWh

So this is the total amount of electrical power purchased.  So now just multiply this by the  cost in dollars/kWh

8,760 * $0.07/kwh

= $613.20

Just a side note, 1kWh per day is pretty darn now, this would be enough to run your fridge and a TV but not an air conditioner and all the other stuff in your house.  At that rate you would only be pulling 8 amps, your house probably has 200 amp service available