Question

In a house and electric bulb of hundred watt four tube lights each of 40 Watt are used for five hours per day if the cost of one unit is Rs.5 calculate the amount of electric bill for 30 days

Answer 1

Answer:

Rs 7.80

Explanation:

TOTAL APPLIANCES:

1 bulb

4 tube light.

POWER RATINGS:

1 bulb= 100W

1 tube light = 40W

TOTAL POWER CONSUMED= 1×100+4×40

=260W

GIVEN:- Usage is 5h/day for 30 days.

hence,

TOTAL USAGE= 5×30=150h

now ,

TOTAL ENERGY CONSUMPTION

= 260 × 150/5 =7800W

In kWh= 7800/1000=78

(I unit= 1kWh)

So,

bill= 78×₹5

= ₹390.

Answer 2

Answer:

Explanation:

rupees 195