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Volt-amperes (VA) are used as a measurement of "apparent power" delivered to a load, calculated as the RMS voltage times the average current measured at the input to the device. Wattage is used to express true power dissipation in an AC circuit, calculated by integrating the product of current through the load and voltage over time. These may sound like they would be the same, but the characteristics of AC circuits can be such that some of the current flowing into the circuit is stored and then discharged back into the power line, without actually flowing through the circuit.
An AC circuit has a characteristic called the power factor (PF) that determines the relationship between true and apparent power; i.e., the conversion between volt-amperes and wattage. It varies from 0.0 to 1.0, but proper designs should have a PF close to 1.0, so frequently there is little difference between watts and VA. The wattage will always be lower than or equal to the volt-amperes. In the case of devices with significantly low power factors (such as fan motors, which may be around 0.65 when running and as low as 0.1 when first turned on), the wattage may be significantly lower than the volt-amperes, which can be a concern when using watt ratings: One might expect a 960-watt device to draw 8 amps at 120V, but if it has a PF of 0.65 it would actually draw 12.3 amps. This could be a problem if it is plugged into an outlet on a 10-amp breaker!
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoWatts = amp x volts. As you can see by the formula you have parameters missing. You need a number for the voltage so that you can calculate the amperage. Amps = Watts/Volts
AnswerYou cannot convert watts to ampere hours, because they measure two quite different quantities. A watt is used to measure power, whereas an ampere hour is a measure of charge.Wiki User
∙ 10y agoA volt ampere is used to measure the apparent power of a load. Apparent power is simply the product of the supply voltage and the load current.
Wiki User
∙ 15y agoHere is a fine calculator to help you. Scroll down to related links and look at "Volts, Watts, and Amperes".
Wiki User
∙ 14y agoUse the WAV: Watts = Amps x Volts
Amps = current
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How many amps would a 15watt radio draw in the transmit mode with 12 volt being supplied to the radio?
1.25 amps
What size generator to power 220 volt three quarter horsepower well pump?
Answer Generators usually always go by watts. To figure this all you do is take(volts x Amps) = watts. You know the volts (220) then look on the pump for the amp rating and then multiply them and you will have your watts. Then get a generator that is rated for this amount for continuos operation not peak watts. Hope this helps.
What is stronger a 1 amp battery charger or a 9v battery?
You cannot compare these two totally different things. As far as amperage the charger puts out more amps if it is an auto battery charger and also puts out 12 volts. If you are talking about a 9 volt battery charger then the battery may or may not be more powerful, it depends on how many mii-amps the charger is putting out.
Are there 100A available on both bars of a 100A panel in a home and for instance can you draw 75A on each bar?
The amp rating of a panel is based on the size of materials used (the bars, etc). You can pull 400 amps through your panel (provided a 400amp breaker was in place); but it would probably melt down very quickly. Basically you have 100 amps total to play with: be it from two 50amp breakers or 30 subpanels pulling 3 amps. :D You just can't pull more than 100amps at one time or the main will trip. The 100 amps is a rating for each bar. If your panel has a 100 amp double pole breaker, then you can use up to 100 amps on each pole. You really shouldn't draw more than 80 amps continuously. But you can count on having that 160 amps avilable if all your loads use only one hot leg of the panel (120 volt loads instead of 240).
What does 0.20 Amps mean?
Amps is a unit of measure for current and .2 is just the measurement. (Amps is short for Ampere's)
How many amps are in 40 volt amps?
Multiply the vots by the amps to find the volt-amps. Or divide the volt-amps by the voltage to find the amps.
What is the difference between amps and volt-amps?
Amps is a measure of current flowing in a circuit. Volt-Amps or (VA) is a measure of power and is equivalent to wattage for a pure resistive load.
How many volt amps in 12 volt battery?
Depends on the battery. It is listed on the battery as Cold Cranking Amps (CCA).
How do you convert 208 volt amps to 480 volt amps?
Add another leg of 120 to a three pole breaker.
How do I figure the amp draw of a unit that is rated max 590 watts at 120 volts?
The formula you are looking for is I = W/E. Amps = Watts/Volt.
What is the amps of a 7.5 hp 480 volt 3 phase?
88 amps
What is 70 kVA?
70,000 Volt Amps
How volt and amps used in house?
230
How many amps is 4800 watts at 220 volt?
you will need 21.81 amps at 220v
How do you calculate volts with volt amperes?
Divide the circuits amperage into the volt amps and you will get the voltage.
Convert Volt-amps to total amps?
To find your amps, divide your volt amps listed by the voltage you are using (and the device is rated for).Power in watts = Volts X AmpsVolts equals amps X resistance. All of these formulas can be transposed to find the missing element.If something is listed as 360 Volt amps and the voltage used is 120 volts it draws 3amps. So if the same device was used on a 240 volt circuit it would draw 1.5 amps. the power company charges for power (watts) so the volt amps are listed on the device and costs you the same regardless of the voltage used.If the same thing was designed for 12 volts it would draw 30 ampsThe current in amps is equal to the apparent power in volt-amps divided by the voltage in volts:A = VA / V
Can you hook a car amplifier to a home stereo?
No you cannot house amps use 120 volt ac car amps use 12 volt dc
