How compute ac energy cost in my house using ac  volt / current meter?
414310
You cannot determine KWH usage with AC in that way.\n\nIf you looked at the voltage, it would be a sinewave.\nIf you could look at the current, it might also be a sinewave, but it is very unlikely that it would be in perfect phase with the voltage.\n\nOnly if the current and the voltage are in perfect phase with each other can you determine watts by multiplying current times voltage.\n\nThe arithmetic you are suggesting will work only when the power factor is exactly 1.00, which could be close to correct if the load is all incandescent lighting, but will not be correct if the load is inductive, such as electric motors, or capacitive.\n\nTo measure power usage, you will need a watt-hour meter, similar to what the utility companies provide.\n\nThe following source (found via Google) explains it:\n\n"A common misconception is that power is simply the product of voltage times current, implying that any ammeter can be used to determine power usage. This is only true in  a few special cases."
335846
Power Consumption is the rate at which you use power (watts).\nPower used in your home is measured in killo-Watt hours and is priced as $ per KW-hr used. \n\nSo at $.40 per kW-hr rate and you use 300 kW-hr in a month then your cost would be $.40 x 300 = $120\n\nnote: killo = 1000
960390
Get an electrical heating element, a DC power supply, a thermometer, a voltmeter and an ammeter.\nPass electricity through the heating element, dipped into a measured volume of water (or salt water) in an insulated cup, and measure the current, the voltage and the time taken. This will give you the heat energy supplied. Measure the temperature rise, and work out how much energy would be required to raise 1g of water (or salt water) by 1 degree Celcius. The answer should be close to 4.2!
739842
To work this out you must find out the power rating (in watts). Most of the time this information is written on the appliance. For example a standard electric kettle may use 1300 watts. \n\nElectricity is sold in units of 1000 watts per hour. For example if you use 10 100w light bulbs for an hour it will cost you 1000watts or 1 unit of Electricity\n\nYou will have to find your power rating on your appliance then compare an hour of usage of that appliance with the price of 1 unit of power (1 Kilowatt per hour)
1111519
To get an accurate number, you will need to call the local utility.  Be prepared to answer the question on if you mena the city only, the metro area, or the province.  Also aske for the average per person and you can probably figure it yourself.
883396
If you are referring to electric clocks (works by a electric moter turning gears) and not electronic digital clocks, you should check your AC voltage throughout your house. It is probably too high. You can buy inexpensive multimeters at radio shack or most hardware stores.  If you are running too high (or too low), you should contact your electric company immediately, as you can also damage your appliances and electronic equipment.  I believe the acceptable range is from 115 to 125 volts.
162775
One kilowatt used over a one hour period is one kilowatt-hour.  To find out how many kilowatt hours an electrical appliance uses, look on the label (wattage - say 300 watts).  Divide that by 1000 to get kilowatts (0.3 kilowatts).  Now multiply it by the time you are going to use it for (say 20 minutes [6 kilowatt-minutes] - divided by 60 minutes in an hour [0.1 kilowatt-hours]).  The result should be the number of kilowatt-hours used.
853402
Plug in 400 for x, plug in 399 for x, and subtract.  That's the marginal cost.  When I did this I got $830 for 400 and $828 for 399, so MC = $2 but you should check this.
895061
Assuming you're in the UK then it varies depending on whether you pay as you go (key meter) or are billed monthly or quarterly.  It also varies as between suppliers.\n\nHowever as a general guide EDF (Formerly London Electricity) charge 15.11p per day as a standing charge and 9.60p per KW hour for the electricity you use.  \n\nIf one forgets the 15.11p daily charge then burning 10 100 watt light bulbs for one hour will cost you 9.60p.  Which is the same as having used 1000 watts of electricity.
517654
Need to know the impedance of the solar panel to determine current.
732893
we know that for power, P=IV. we also know that whatever power goes into the transformer comes out of the transformer(conservation of energy). this means that V is inversely proportional to I. or I is inversely proportional to V.\n\nif you already know how much V was stepped up, then just step down the I by the same ratio. for eg, if 110V 10A was transformed to 220V, then the step up ratio is 2. therefore current is stepped down by 2. so current will be 5. try equating 110x10 with 220x5, it is constant.\n\nall of this assumes that the transformer is 100% efficient. if there are losses due to heat, then you multiply the exit current by the efficiency factor. eg, if the trans is said to be 80% effiecient, then the actual exit current would not be 5A but 4A. voltage is not affected by effiency issues.\n\nby the way transformers only work with AC, the guy who mentioned direct currents is thinking of current rectifer not transformer.
806941
The best way to measure is to plug the monitor and computer into a surge protector, them use a clamp-on ammeter on the cord from the surge protector where it plugs into the wall.  Multiply the value of amperage times the 110 voltage (U.S. homes).
246806
Depends on where, i.e., 3rd world or in California. No land or regulaorty issues, then the cost should be approx. $600USD per Kwh.
187108
The voltage and frequency of alternating current (AC) electricity used in homes varies from country to country throughout the world. Typically either 110-volt AC (110V) or 220-volt AC (220V) are used. Note that 110 volts and 220 volts are averages, since the voltage does fluctuate during usage. Most countries use 50Hz (50 Hertz or 50 cycles per second) as the frequency of their AC. Only a handful use 60Hz. The United States uses 110V and 60Hz AC electricity.\nHow values were selected\nThe type of electricity delivered to homes and businesses was first direct current (DC) but then changed to AC electricity. The standard voltage level started at 110V, went to 240V, back to 110V, and then to 220V. The frequency started at 60Hz and then went to 50Hz in most areas.
261277
It's simple do this job. First of all you need to set your volt meter to a specific voltage level. Like if you want to check voltage of batteries, it ranges between 1.5 to 14 volts. So set your volt meter dail to DC (Direct Current) with this voltage specification.\nFor checking voltage in your house, its a 110-120 V or 220-240 V. This depends on your location. So now you have to set the dail to AC (Alternating current. THe symbol of AC is " ~ ".\n\nI', also a site here. It would solve the job definitly.\n\n\nhttp://www.ehow.com/how_16767_voltmeter.html
130798
ask your electricity provider if they have a budget program. That is what I did with my gas bill.
788402
You can find the current flowing through a Wheatstone bridge by using Kirchoff's Loop Rules and Junction Rules.      \n\nThe sum of the Voltage Sources - Voltage Drops = 0 in a closed circuit.  \n\nThis setup can be solved using a matrix or a CAS. \n\nGood Luck