Depends on the resistance of whatever you're trying to run the current through. This is given by P=(I^2)*R
Where P is the power in Watts, I is the current in Amps and R is the resistance in Ohms.
For more info go here:
http://en.wikipedia.org/wiki/Electric_power
385
Clarification:You need to specify voltage AND AMPS to know the watts.As such, the above answer is irrelevant.
At 12 volts, 3.5 amps would be 42 Watts
At 110 Volts, 3.5 amps would be 385 Watts
At 120 Volts, 3.5 amps would be 420 Watts
At 240 Volts, 3.5 amps would be 840 Watts
The general formula is: Amps * Volts = Watts
there are 60million amps in just a single volt! could you imagine!
You need a second variable to work your amperes outTo find the Voltage, ( V )
[ V = I x R ] V (volts) = I (amps) x R (Ω)
To find the Current, ( I )[ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
To find the Resistance, ( R )[ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
i.e 5 Volts and 1k (1000) ohm resistor
5/1000 = 0.005 amps, = 5 mA
Jules
Watts are Amperage multiplied by Voltage. You need to tell me what voltage you're using to power whatever is drawing the 3.3 Amps.
Are you using 120 Volts? 240 volts? 347 volts?
to figure out Watts take the Amps and multiply by the voltage, I'm going to use the 120 volts for this example:
120volts x 3.3Amps = 396 Watts
240Volts x 3.3 Amps = 792 Watts and so on.
It depends on the voltage there is; e.g. V = 12 volts (car battery). Formula: Power P = voltage V times amperage A. So, power P = 12 volts times 5.3 amps = 63,6 watts. Cheers ebs
The formula you are looking for is W = A x V.
There are zero watts in 4.2 amps.
how many watts does it take to run a paint sprayer
I don't know what exactly you mean by a "heat mat", but your question is kind of backwards. You don't run an electrical device *with* watts. You run them to *produce* watts (watts of light, watts of heat, watts of sound, etc). I believe the thing you are really asking is how many amps are required to run your device. As an example, consider a "1500 Watt heater" that is made to be plugged into a typical wall outlet in your home. The voltage in the wall is 120V, and the heater will produce 1500 watts of heat when plugged into that 120V. To calculate the amps, you divide the watts by the voltage. 1500W / 120V = 12.5A
The formula you are looking for is Watts = Amps x Volts.
Watts = Amps x Volts x Power Factor For a motor the Power Factor is less than 1 and might typically be about .75. For a resistive load like a toaster PF = 1. If you know the Voltage and PF and know the wattage you can calculate amps. Amps = Watts / (Volts x PF)
Wire is rated in ampacity, You can use only 80% of the rated ampacity. Voltage and amperage are inversely proportional. So at 120 volts alternating current you safely run 1800 watts ( I have added a small safety margin). At 240 volts you can run 3600 watts. I hope this has answered you question Ampsxvolts=watts watts/volts=amps
Just take the voltage and multiply it by the amps. That should give you a close approximation of the watts used. For instance, 117 volts at 4.5 amps = 5265 watts.
The formula you are looking for is W = I x E, Watts = Amps x Volts.
W = A x V. Watts = Amps x Volts. There is not a voltage stated to multiply the 6 amps with so an answer can not be given.
how many watts does it take to run a paint sprayer
I don't know what exactly you mean by a "heat mat", but your question is kind of backwards. You don't run an electrical device *with* watts. You run them to *produce* watts (watts of light, watts of heat, watts of sound, etc). I believe the thing you are really asking is how many amps are required to run your device. As an example, consider a "1500 Watt heater" that is made to be plugged into a typical wall outlet in your home. The voltage in the wall is 120V, and the heater will produce 1500 watts of heat when plugged into that 120V. To calculate the amps, you divide the watts by the voltage. 1500W / 120V = 12.5A
The formula you are looking for is Watts = Amps x Volts.
Watts = Amps x Volts x Power Factor For a motor the Power Factor is less than 1 and might typically be about .75. For a resistive load like a toaster PF = 1. If you know the Voltage and PF and know the wattage you can calculate amps. Amps = Watts / (Volts x PF)
The formula for amperage is I = W/E. Amps = Watts/Volts. As you can see there are two values missing from the question.
15 watts
Wire is rated in ampacity, You can use only 80% of the rated ampacity. Voltage and amperage are inversely proportional. So at 120 volts alternating current you safely run 1800 watts ( I have added a small safety margin). At 240 volts you can run 3600 watts. I hope this has answered you question Ampsxvolts=watts watts/volts=amps
A small shredder 100-200 watts.
Assuming you mean 12 volts, then you cannot run any 78 Amp fans. Unless your fans run at 0.38 volts, there is no way to draw 78 amps from 30 watts.