W=watts, V=volts, I=amps or current, R=resistance
W = V x I or, W = I2 x R or, W = V2 / R.
The formula you are looking for is I = Watts/ Voltage, I = 3000/voltage.
You can connect a watt meter to the circuit or it can be done by calculation. By calculation use this formula, Watts = Amps x Volts.
Watts are used to measure power, whereas volts are used to measure potential difference. These are two different quantities, and you cannot convert one into another any more than you can convert kilometres to kilograms.
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my question is what is the formula for pressure?
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Assuming an incandescent bulb and a 120 volt supply the formula is Watts = Volts x Amps x Power Factor where PF = 1 for resistive load. Amps = 400 / 120.
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