About

In electrical engineering, current (I) cannot be converted to voltage (V) directly without a third electrical property defining the circuit's characteristics. This tool solves for voltage using two fundamental principles: Ohm's Law and the Power Law. Diagnosing voltage drop across a component requires knowing the resistance, while determining supply voltage from a load specification often involves power. Precision is key here; a miscalculation in voltage supply can destroy sensitive integrated circuits or fail to drive a load sufficient for operation.

Formulas

Select the known variable to determine the calculation path:

{

V = I × R (via Resistance)V = PI (via Power)

Where R is Resistance in Ohms (Ω), P is Power in Watts (W), and I is Current in Amps (A).

Reference Data

Current (I)	Variable Type	Variable Value	Formula Used	Result (V)
0.02 A	Resistance	220 Ω	I × R	4.4 V
0.5 A	Resistance	10 Ω	I × R	5.0 V
2.0 A	Power	100 W	P / I	50.0 V
10.0 A	Power	2400 W	P / I	240.0 V
0.001 A	Resistance	10000 Ω	I × R	10.0 V
5.0 A	Resistance	2.4 Ω	I × R	12.0 V
4.16 A	Power	500 W	P / I	120.2 V
1.5 A	Resistance	100 Ω	I × R	150.0 V

Frequently Asked Questions

No. Amps measure flow, while Volts measure pressure. You need a third variable-either Resistance (how much the circuit opposes flow) or Power (how much energy is being used)-to bridge the gap mathematically.

If you are measuring a load connected to the battery, use the Resistance mode if you know the load's ohm rating. If you know the wattage of the device being powered (e.g., a 60W bulb), use the Power mode.

The calculation requires division by current. Mathematically, division by zero is undefined. In physics, zero current means the circuit is open, so there is no power consumption, though voltage might still be present at the source.

Yes, for resistive loads (like heaters or incandescent bulbs). For inductive AC loads (motors), the impedance (Z) replaces resistance, but the basic V=I×Z relationship remains similar for magnitude estimation.