How To Figure Amp Draw - Voltage (v) = current (i) x resistance (r) 2. Therefore, there are 5 amperes. Suppose you measured 60w and 12v, calculate the amperes. Ready to crunch some numbers? Power (p) = voltage (v) x current (i) these formulas.
Power (p) = voltage (v) x current (i) these formulas. Therefore, there are 5 amperes. Suppose you measured 60w and 12v, calculate the amperes. Ready to crunch some numbers? Voltage (v) = current (i) x resistance (r) 2.