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Determine amps or volts the same way.
Power formula voltage amps. For example let s say you have an ac 24 40 power supply. You can do the multiplication formula in reverse. The voltage v in volts v is equal to the square root of the power p in watts w times the resistance r in ohms ω. How to calculate with watts amps volts and ohms.
Current a power w voltage v for example find the amperage of a 100 watt light bulb at 120 volts. The convention of using watts amps and volts. Thus to find amps substitute the volts and watts in the formula. The power p in watts w is equal to the voltage v in volts v times the current i in amps a.
The voltage v in volts v is equal to the power p in watts w divided by the current i in amps a. If you want to do an electrical calculation involving voltage current resistance or power reference the formulae circle below. Ac three phase watts to amps calculation formula. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps amperes and resistance r measured in ohms.
This means your power supply has 24 volts and 40 watts. What is the phase current in amps when the power consumption is 330 watts the power factor is 0 8 and the rms voltage supply is 110 volts. For example a current of 2a flowing through a bulb with a voltage of 12v across it generates 24w of power. So amps are equal to watts divided by power factor times volts.
I 330w 0 8 110v 3 75a. The power source can supply 1 6 amps. The si unit of voltage is a volt the unit of amperage is an ampere usually shortened to amp and the unit of power is a watt. A w pf v example.
Amps watts pf volts or.
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