Question

4 bulbs rated 100W each, operate for 6 hours per day. What is the cost of the energy consumed in 30 days at the rate of ₹5/kWh?

Answer 1

Hint:Firstly, you have to calculate the power consumed by 4 bulbs. Then, find electricity or power consumed in a day as well as in 30 days. After that, find the total cost of the resulting power or electricity consumed.

Complete step-by-step solution:
It is given that,
Four bulbs consume the power of 100W each.
 The total power consumed by 4 bulbs\[=4\times 100\]
$=400$W
Total Energy consumed in a day
\[=400\times 6\]
=\[2.4\]KW per day
Electrical Energy consumed in 30 days
\[=2.4\times 30\]
$=72$KW
So,$72$KW is the total electrical energy required in 30 days.
The cost of 1 unit of electricity = ₹\[4\]
Thus, the total cost of electricity
= ₹ 5 x 72
= ₹ 360

Additional Information:
Power is defined as the amount of energy or electricity being transferred or converted or you can say used in a simpler form, per unit time. According to the international system of units, the unit of power is the Watt represented by the symbol 'W' that is equal to one Joule per second or you can write in the symbol form which is 1 J/s. In older works, power is sometimes called activity.

Note:Find amount only after doing these calculations as prescribed above or only after calculating final or resulted power. Without following the prescribed way you can't be able to get the perfect answer.