December 26, 2012

How to calculate monthly electricity bill?_Electrical Power or energy calculation

The unit of energy measurement shown on an energy meter is Kilowatt-hour(kWh).
Therefore, When we say 1 unit, it is 1kWh.
(i.e.,) 1 unit = 1kWh.

Now, to calculate the energy consumed in joules for using an equipment rated at W (say, 40W) for a period of T (say, 1Hr).

We have,
1 watt = 1 joules/second = 60 joules/minute = 3600 joules/hour
Similarly,
1 kilo-watt =  3600*1000 joules/hour = 3.6MJ/h

Therefore, 40W = 40 joules/second

If a 40W light is lit for 1 hour,
Energy = 40 * 1 = 40Wh
For this 40W light to consume 1 unit of power, it should be lit for t = 1000/40 = 25 Hrs.

Approximate power rating for various domestic equipments are listed below. (Ratings may vary)


Appliances/Device
Approximate Load (Watts)


Lamps (Bulb)
60


Lamps (CFL)
15
Tube Lights
40
Electric iron
750
Immersion heater
1000
Water heater/Geyser
2000
Instant Geyser
3000
Refrigerator (165 liters )
150
Window air -conditioner
( 1.5 ton)
2650
Room cooler ( medium)
200
Table fan/ceiling fan
75
Exhaust fan
150
Washing machine
400
Television
100
Mixer
500
Wet Grinder
300
Microwave oven
1200
Computer
200
Mosqutio Repeller
9
Pump motor (1 HP)
740
Battery Charger
7


Similarly you can calculate the energy consumption for home appliances individually for a day and the sum will give energy consumption for a day and multiplied with 30 gives your monthly consumption. Multiplying with 60 gives you bi-monthly consumption.
You can calculate monthly consumption here.

Disclaimer:
The above article doesn't give you any guarantee and the sole purpose of this article is to share my learning in the way I understood. Any comments to refine this article are welcome with great pleasure. Please report any breaking link by commenting below.

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