Ever calculate how much electricity used by your home appliances and other electric-power equipment at your home? You can find the total usage of your home electricity from your monthly electric bill, but you may want to measure the energy used by each electric-powered items at your home, then how to do the measurement?
No matter what reason you want to measure the energy used by an electric-powered item at your home, basically there are three ways to measure it:
1. Use a simple watt-hour meter
You can use a simple watt-hour meter, which can be purchased at your local store. Just plug-in the device to the watt-hour meter and then plug the meter into the supply point. When the device is drawing current, the watt-hour meter will read the usage. This little device will tell you how much electricity uses at a given moment and over an extended period of time. This simple watt-hour meter is especially useful for finding the amount of electricity usage, measured in kWh for devices that don’t run constantly, like window unit air conditioners and refrigerators.
2. Install a whole-house meter
If you like to monitor whole house energy uses at any give moment, or how much you have used so far for the month, then you might want to consider an installation of a whole-house meter. The meter is similar to the electric meter at your home, but it has extra features that enable you to measure the electricity usage at a selected period of time. Once you press the reset button, the meter reading will be reset to zero, it will record the electricity usage until you stop it. This whole-house meter is very useful for you to monitor monthly electricity usage, which you can use to compare with the figure stated in your electric bill and make sure you are not overcharged.
3. Look at the electric meter
If you don’t want to spend money to buy watt-hour meter or install a whole-house meter, you still can measure the electricity using at a give moment. You just need to make use of your home electric meter.
This is how it can be done:
First, turn off the device you want to measure. In order to accurately measure the electricity usage of the device, you have to turn off the air conditioner and refrigerator because they will affect the reading if they kick in while you are making the measurement. Then, go to your electric meter and measure with a stopwatch on how long it takes for the disc to spin one round. Then, turn on the device you want to measure and go back to your electric meter to measure how much time it takes to spin one round.
Once you have the reading, you are ready to do the calculation. Look on the electric meter find something printed like “kh X.X”, where “X.X” is some number, normally is 7.2. This figure is called Kh factor.
The formula for calculation is: 3.6 x Kh fator / number of seconds = kW
Just plug-in the measurement and the Kh factor into the formula to get the electric usage of the device for a given time. For example, the Kh factor is 7.2. It took 60 seconds for the disc of the electric meter to spin when the device is turned off. And it took 40 second for the disc to spin when the device is turned on. Your first check when device is off showed you were using (3.6×7.2)/60 = 432 watts. With the device turned on, the usage is (3.6×7.2)/40 = 648 watts. By subtracting the 2 figures, you will get 216 watts, which is the power usage of the device selected for power usage measurement.
Dave Stillman reviews various Home Energy Guides at http://www.wind-solar-power.info. Read his reviews before you buy any of these guides. Find the best step-by-step Home Energy Guides from Dave’s resources.
Thank you for reading, British Gas Energy Smart
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{ 26 comments… read them below or add one }
We are taking some of these out because of dials getting stuck between the 10’s or multiples thereof.
I think none, check the agreement between the company and their customers about waivers when their meters are being read. I would think you would be covered by workmen comp
well if you are using wooden poles then there is no general rule of taper due to knots and the poles also sometimes tend to be bowed.
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NO U
#pressrelease: Spending on Electric Power Transmission & Distribution (T&D) Equipment to Reach $107 Billion in 2010
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compared to last year, our Gas usage has went down 42% and electricity 34.9%
The question is written to allow for a rather simple solution, unlike the challenges of real wind turbine power and energy estimation.
Energy = Power x Time
Electric power produced = conversion efficiency x gross wind power
Gross wind power = power density x turbine swept area
So, with all the equations at hand, we can solve the problem.
Turbine swept area = 2 x pi x (25 m)^2 = 3927 m^2
Wind power density = 500 W/m^2
Thus, Gross wind power = 500 W/m^2 x 3927 m^2 = 1.9635 x10^6 W = 1.9635 MW
Electric power produced = 0.25 * 1.9635 MW = 0.49087 MW
Since the problem identifies the wind power as long-term average, we can calculate the average energy produced in a year.
Energy (Joules) = Watts x seconds
Energy = 0.49087 MW x 31536000 s = 15.487 x10^6 MJ
But the question asked for energy measured in kilowatt-hours (kWh).
So, Energy = 490.87 kW * 8760 h = 4300100 kWh produced in 1 year.
Unfortunately, a real wind turbine would produce this energy in an unscheduleable manner, typically peaking when the demand (load) is lowest. That's the challenge of wind energy.
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All of a sudden, I don't wanna be back, not in this period of time. Sigh.
if 250 amps is the sum of the currents in all 3 phases, then wattage is 120 x 250 watts. Divide by 1000 to get kW, and multiply by 8 hours to get kW-hrs.
Then multiply by cost per kW-hr (7¢ is more likely than 0.07¢)
.
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Can that laser burn anything?
HEY!!I HAVE A FERRET THAT WAS OFFENSIVE AND IM UNSUBSCRIBING!
Only buy the best, they cost less in the long run.
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Grapes are good cos they're really sweet but still fruit. Dark green veg like spinch help with iron but you really need red meat to get your iron levels up (or a supplement)
RT All the emails for deferred entries to the British Gas Great North Swim have now been sent out – check your email for full details.
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Could be!
Still a rip off. You said sending replacement cards w/ $. No cards yet. 5 wks. Making local store look bad. You've sold out.
ESAB Plasma Flow Measuring Kit – 19765: P3 International P4400 Kill A Watt Electricity Usage Monitor Kill A Watt…
Degrees or radians of the unit circle in trigonometry might fill the bill.
2011-01-21 17:35 発電量［今日：5.1 kWh 今月：115.7 kWh 今年：115.7 kWh］ メーター指示値：147.9 kWh
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