A refrigerator consumes 280 W of electric power when it is running. The cost of

Question

A refrigerator consumes 280 W of electric power when it is running. The cost of electricity is 10 cents per kWh. What is the yearly electricity cost of this refrigerator, assuming that it runs only half the time? (3yr =365 days) Consider a city with 200,000 households, with the average of 700 kWh of electricity just to run each refrigerator. Assuming that each house has only one operating refrigerator, determine the amount of C02 production in the city, due to the operation of the refrigerators only. (On average, 0.59 kg of CO2 is produced for each kWh of electricity)

Explanation / Answer

15. power = 280 W = 0.28 KW

number of hourse in a year= 24*360=8640 hrs

but the refrigerator work for only half hrs

therefore working hrs for refrigerator= 8640/2=4320 hrs

total Kwh= power*hrs= 4320*0.28=1209.6 KWh

so price= 1209.6*10= 12096 cents

2.total power consumed= 200000*700=1.4*108 KWh

amount of CO2 produced= 0.59*power= 8.26 *107 Kg/hr

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