Physics

Problem

A household uses the following appliances. • Six tube-lights each of

40\,\text{W}

for

5\,\text{h}

per day. • Four ceiling fans each of

75\,\text{W}

for

10\,\text{h}

per day. • One television set of

150\,\text{W}

for

3\,\text{h}

per day. • One electric kettle of

1.5\,\text{kW}

for

30\,\text{min}

per day. The electricity tariff is Rs

7

per kWh. The family plans to buy a

1.5\,\text{kW}

air-conditioner (AC). a. (i) Calculate the total electrical energy consumed by the listed appliances in one day. b. (ii) Determine the total electrical energy consumed in a

30

-day month and the corresponding electricity bill. c. (iii) The family wishes to keep the monthly electricity bill within Rs

1500

. For how many hours per day can the

1.5\,\text{kW}

AC be used without exceeding this limit?

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