Every month when you get electricity bill, you may not think a whole lot about what goes into it. But in fact, every electronic device or appliance we use adds a little something to your bill. By figuring out the electricity usage of each device you can simply manage your electricity bill.
Calculating the energy cost of an appliance or electronic device is fairly easy. Most devices have a label that lists how many watts it uses, either on the device or in the owner's manual. You will also need to estimate how many hours a day you use a particular appliance.
Calculate Electricity Bill- 4 Simple Steps
STEP 1 : Watts Per Day
Calculating the energy consumption cost needs a simple calculation. simply multiply the unit's wattage by the number of hours you use it to find the number of watt-hours consumed per day.
For example, let's say you use a 50 watt laptop for 3 hours per day. Multiplying the wattage by the number of hours used per day, we find that you are using 150 watt-hours per day.
50 watts X 3 hours = 150 watt-hours per day
STEP 2 : Convert to Kilowatts
But the electricity bill measure was in kilowatt hours(Units). Since we know that 1 kilowatt is equal to 1000 watts, dividing the watt hours per day by 1000 we can convert to kilowatts per day.
150 watt-hours per day / 1000 = 0.150 kWh per day
STEP 3 : Usage for Month Period
By multiplying the month days with kWh per day we can get this figure. So, finally you figured out the monthly usage of your laptop.
0.150 kWh per day X 30 days = 4.5 kWh per month
STEP 4 : Figuring Out the Cost
Checkout the last mont electric bill to get the 'Cost per unit'. For this example, let's say you pay 5 Rupees per unit (unit=kWh). To find how much your laptop is costing you in a month, multiply your electricity rate by the kWh per month that you calculated above.
4.5 kWh per month X Rs.5 per kWh = Rs. 22.5 per month
The wattage on appliances or electronics varies by device. Typically, older model appliances use more energy, but newer models tend to be more efficient.
List of Common Wattage for Household Appliances:
25" colour TV - 150W
Ceiling Fan - 25W to 75W
Desktop Computer - 100W to 450W
Fridge / Freezer - 150W to 400W
Air Conditioner - 1000W to 4000W
Internet Router - 5W to 15W
Laptop Computer - 50W to 100W
LED Light Bulb - 7W to 10W
Table Fan - 10W to 25W
Washing Machine - 500W to 500W
Don't wait.. go ahead and start saving your monthly expenses.
Follow @timepasspopcorn
