When power and voltage are given use I PV to calculate the amperes. Simple to use Ohms Law Calculator. Relationship Between Voltage Current and Resistance.
V IR where you measure the value in volts What is an Equation for Power.
P W V V I A AC Ohms law calculator. Ohms law states that the potential difference voltage between two points is proportional to the current flowing through a resistor and also proportional to the resistance of the circuit. I VR 20 V 25 MO 8 mA. V I R.