Question

if an electrical bulb of 100 w is lighted for 2hrsdaily how much electrical energy would be consumer per day also find the cost if cost per unit rs. 2​

Answer 1

if the 100 watt bulb is lighted for 10 hours it will be 1 unit so according to question 2 hours will become 10 hours in 5 days and in a month there are 30 days means 5 / 30 equals to 6 units in a month and if the cost of 1 unit is to rupees then cost of 6 units equals to 6 x 2 equals to 12 rupees, now to get cost of 1day divide 12by 30 you will get the answer 40paise.

Answer 2

Electric energy consumed per day

= power of bulb * no. of hrs.

= 100*2

= 200 wh

= 0.2 kwh

so, cost of lighting bulb = rate * electric energy

= Rs (2*0.2)

= Rs 0.4

That means cost of lighting bulb for 2 hrs. = 40 paise.