00:01
Hi, here in this given problem there are two parts and for each part for both the parts.
00:08
Cost of electric power consumed, this is given as 12 .0 cent per kilowatt hour.
00:26
Now in the first part of the problem part a there is a bulb whose power power is given as 75 watt or we can say this is 75 by 1 ,000 kilowatt and for a year time in hours that will be days, a number of days 365 in each day there are 24 hours so this time we may leave it as it is.
01:24
This is in hours.
01:27
So in one year energy consumed will be, if we let the bulb glow for the whole of the year, then energy consumed will be power into time.
01:47
Means this is 75 by 1000 kilowatt hour multiplied by 365.
01:58
Here this is just kilowatt multiplied by 365 into 24 hours.
02:10
So it is calculated to get 657 kilowatt hours will be consumed in a year.
02:22
So yearly cost of running that bulb throughout the year, that will be given by the product of the rate 12 .0 cent per kilowatt hour with the total energy consumed 657 kilowatt hour.
02:48
So canceling this kilowatt hour here it comes out to be equal to 7884 or we can say 78 .84.
03:06
So to convert this answer into two significant figures only, we can say it to be equal to $79...