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6- If a household appliance has a power rating of 1000 watts (1 kW) and it operates for 5 hours per day, how much energy does it consume in one day?a) 1000 kWhb) 5 kWhc) 5000 kWhd) 5 kWh/day7-If the price of electricity is $0.12 per kWh, what is the cost of running a 100-watt light bulb for 10 hours?a) $0.01b) $0.12c) $1.20d) $12.008-A household consumes an average of 800 kWh of electricity per month. If the price of electricity is $0.15 per kWh, what is the monthly electricity bill?a) $80b) $120c) $100d) $150

Question

6- If a household appliance has a power rating of 1000 watts (1 kW) and it operates for 5 hours per day, how much energy does it consume in one day?a) 1000 kWhb) 5 kWhc) 5000 kWhd) 5 kWh/day7-If the price of electricity is 0.12perkWh,whatisthecostofrunninga100−wattlightbulbfor10hours?a)0.12 per kWh, what is the cost of running a 100-watt light bulb for 10 hours?a) 0.01b) 0.12c)0.12c) 1.20d) 12.008−Ahouseholdconsumesanaverageof800kWhofelectricitypermonth.Ifthepriceofelectricityis12.008-A household consumes an average of 800 kWh of electricity per month. If the price of electricity is 0.15 per kWh, what is the monthly electricity bill?a) 80b)80b) 120c) 100d)100d) 150

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Solution

6- The energy consumed by an appliance is calculated by multiplying the power rating by the time it operates. So, for a 1000 watt (or 1 kW) appliance running for 5 hours, the energy consumed would be 1 kW * 5 hours = 5 kWh. So, the answer is b) 5 kWh.

7- The energy consumed by a 100-watt light bulb running for 10 hours would be 0.1 kW * 10 hours = 1 kWh. At a cost of 0.12perkWh,thecostwouldbe1kWh∗0.12 per kWh, the cost would be 1 kWh * 0.12/kWh = 0.12.So,theanswerisb)0.12. So, the answer is b) 0.12.

8- The cost of electricity is calculated by multiplying the amount of electricity consumed by the price per unit. So, for a household consuming 800 kWh per month at a price of 0.15perkWh,themonthlyelectricitybillwouldbe800kWh∗0.15 per kWh, the monthly electricity bill would be 800 kWh * 0.15/kWh = 120.So,theanswerisb)120. So, the answer is b) 120.

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