00:01
Hello students, here is a given question and the question says, what says, an electrical reprificator rated 400 worth, means the power is equal to given, that is 400 watt, okay? operate 8 hour per day, 8 hours per day, okay? what is the cost of electric energy to operate in 30 days? okay, cost 430 days.
00:26
4, 4, 30 days.
00:31
We have to find out this.
00:32
What is the value of this? and 1 kwx, the rate of 1 kwx means 1 unit is equal to 3 rupees.
00:43
Okay, 3 rupees.
00:45
Now we know that.
00:47
We know that.
00:49
What we know, the power is equal to energy divided by time, then the energy will be equal to power into time.
00:56
And we have to find out the energy into kwh, kilo -watt -r.
01:00
Okay.
01:00
Now, the energy is equal to what is the p? p is given that is 4 -4 -10, multiplied by.
01:06
The time is given that is 8 -r in a day, then in a month, that is multiplied by 30.
01:12
And this will be equal to in water.
01:15
We have to convert into kilowatt -r, then divided by the 1 ,000.
01:19
This is converted into kw -h...