how do you know how much electricity you use?
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Most devices have a label listing how many watts they use. You can find this wattage label either on the device (usually on the bottom or back) or in the owner's manual. If you can't find the wattage label, there are a couple other options to determine how much power the device uses.
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So to find the current drawn, simply divide the power by the operating voltage. In the United States, most household appliances work at 110 Volts. So the calculation is divide the Wattage by 110. For example: A 40 Watts bulb draws 0.36 Amps to operate.
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Calculate the kWh use for each appliance. The formula for kWh is watts multiplied by hours used and then divided by 1000. For instance, a 100-watt light bulb used for 10 hours would use one kWh. Add all of the kWh totals from your appliances to get an idea of your electrical load that you use every day.
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Calculate Watt-hours Per Day One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.
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['Find the Appliance Wattage: The wattage is usually stamped on the bottom, back or nameplate of your appliance. ... ', 'Estimate Daily Killowatt Hours (kWh): (Wattage x Hours Used Per Day) ÷ 1000 = Daily kWh.']
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W is the power consumption in watts. For example, if the electric motor uses 50 amps at 240 volts, the wattage is 50 x 240 x 1.73, or 20,760 watts. Electricity costs are based on kilowatts (kW), so divide watts by 1000 to convert to kilowatts (20,760 wats/1000 = 20.76 kW). Record the time the motor is in operation.
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You can estimate the total running load by adding up the running wattages of all items to be powered. If the name plate show only amps and voltage the wattage can estimated by multiplying volts times amps to calculate watts. Amps times Volts equals Watts. The watts total divided by 1000 is kW.
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To calculate usage, read the numbers you recorded for each dial from left to right (our example reading would be 9079). To determine how many kilowatt-hours (kWh) you have used, subtract the previous reading from the current reading and multiply the difference by the meter multiplier, which can be found on your meter.
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The kilowatt-hour (kWh) is the unit you'll see on your electricity bill, because you're billed for your electricity usage over time. A solar panel producing 300W for one hour would deliver 300Wh (or 0.3kWh) of energy.
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['The efficiency of a device, such as a lamp, can be calculated:', 'efficiency = useful energy out ÷ total energy in (for a decimal efficiency)', 'or.', 'efficiency = (useful energy out ÷ total energy in) × 100 (for a percentage efficiency)']
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How do I calculate the maximum power that my electrical installation can supply? To calculate the maximum power that your meter can supply (expressed in volt-amperes), multiply the voltage (U) by the intensity (I) of the current that supplies your home.
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To calculate commercial electrical load, you simply need to add together the wattage used when you combine all lighting, appliances, systems, etc. In other words, the wattage used by all commercial electrical loads in your premises.
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['fixture watts = bulb watts × bulb quantity.', 'kWh = Power(W) × Time(hrs) ÷ 1,000.', 'monthly kWh = kWh per day × 30.', 'price = kWh × cost per kWh.']
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Our Power Meter measures the energy consumption and running cost of any standard plug-in appliance. It measures: Watts - Instantaneous power usage. kWh - Total power usage over time (what you are billed for).
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Multiply the unit's wattage by the number of hours you use it (this will give you a certain amount of “watt-hours”). For example, if you use a 120-watt television for two hours per day. You can multiply the wattage by the number of hours used per day to obtain 240 watt-hours per day.
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Divide this number by 1000 to find kilowatts. For example, an appliance that uses 12 amps and runs on North American electricity would use 1440 Watts, or 1.44 kilowatts.
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Electricity usage is calculated in kilowatt-hours. A kilowatt-hour is 1,000 watts used for one hour. As an example, a 100-watt light bulb operating for ten hours would use one kilowatt-hour. Below are some examples of electrical appliances found in most homes.