A house has one 100 W bulb, two 60 W bulbs and one 30 W bulb. Determine the cost of having all the bulbs switched on for 70 hours, given that the cost of electricity is 40 cents per kilowatt hour.

      

A house has one 100W bulb, two 60 W bulbs and one 30 W bulb. Determine the cost of having all the bulbs switched on for 70 hours, given that the cost of electricity is 40 cents per kilowatt hour.

  

Answers


John
Total power consumed = 100 + (2 x 60) + 30 = 250 Watts

Consumption in Kwh = $\frac{250}{1000}$ x 70 = 17. 5 Kwh

Cost of electricity = 17.5 x $\frac{40}{100}$ = Ksh 7. 00
johnmulu answered the question on February 20, 2017 at 05:25


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