Here is the formula
Bill Amount=
(P*T*D*$)/1000
Explanation
1. P=
Power of Appliance (in watts/kilowatts)
Many
high power appliances have labels on their back stating power ratings in watts,
indicated by “W”.
Some
have rating written like 200-300W, in these cases chose middle value,
250W.
For Example a fridge labels 190 W
Now
convert these watts into kilowatts by simply dividing them by 1000. If label
provides the ratings in kilowatts then skip this step.
From above example 190/1000 = 0.190kilowatts
2. T=
Number of hour you use your appliance in one day
At
this stage, you must know that for how long, in a day, you use the appliance.
Example fridge is in use 24 hrs. So, 0.190*24= 4.56 kilowatt-hours
3. D=
Number of days you are measuring for
Now you know how
many kilowatt-hours the device uses every day. To calculate your kilowatt-hours
per month or per year, just multiply by then number of days in that period.
Example Fridge is used whole moth(30
days) 4.56*30= 136.8
4. $=
Cost of one electricity unit in your country (One electrical unit =kWh)
Your electricity
bill lists the cost per kilowatt-hour. If you don’t find it there go to you
electricity provider’s website and search for electricity charges. Like my
country charges five rupees for one unit.
Example 136.8*5= 684
rupees
Here
you go; you have learnt to measure your electricity expenses.
No one knows everything, If you find anything wrong please let me know. So that we all help each other to learn and grow.