Power To Voltage Calculator
Convert electrical power (watts) to voltage quickly — enter power and current (amps) to get voltage, or convert using resistance. Accurate results, clear units, instant output.
power to voltage formula
Voltage can be calculated using power / current or P/I: V = P ÷ I. When the value of resistance is known and that of current unknown, V = 2(P1 R). With units, enter your values to instantly obtain volts.
Formula & Table Summary:
- V = P / I (Voltage = Power ÷ Current)
- V = √(P × R) (Resistive case)
- P = V × I ; I = P / V
Units: P in W, I in A, V in V, R in Ω.
power voltage converter simple
A Power to Voltage Calculator takes electrical power, as expressed in watts, and calculates it out to be voltage, as expressed in volts; using known current, as expressed in amps, or known resistance, as expressed in ohms. In most practical conversions one supplies power and current the calculator will give you voltage using V = P/I. In the case of resistive circuits one can say that V = V = (P x R) 12. The tool is used to aid electricians, students, and amateur researchers with quick estimates of the voltages necessary in a machine based on their power and operating current as well as to compare requirements of the supplies and to check calculations in DC systems. Units are dealt with automatically and example given to allow you to test typical values. It was designed to be fast and easy to read so it would make a good short-term design check, lab work, or even homework
DC voltage calculator
| Power (W) | Current (A) | Calculation | Voltage (V) |
|---|---|---|---|
| 60 | 2.0 | V = 60 / 2.0 | 30.0 |
| 50 | — | V = √(50 × 25) | 35.355 |
| 100 | 4.0 | V = 100 / 4.0 | 25.0 |
Frequently Asked Questions - Power To Voltage Calculator:
How do I get voltage from power?
Divide power (W) by current (A): V = P / I.
What units do I use?
Power in watts (W), current in amperes (A), voltage in volts (V), resistance in ohms (Ω).
Can I calculate voltage if current is unknown?
Yes — if you know resistance and power use V = √(P × R).
What if I only know watts and volts?
You can find current: I = P / V.
Is V = P × I correct?
No. V = P / I. P = V × I is the correct relation for power.
How accurate is the calculator for AC systems?
Formulas assume DC or purely resistive AC loads; reactive AC needs RMS values and impedance handling.
Can I enter milliwatts or milliamps?
Yes — convert to base units (W, A) first or use the unit selector if provided.
How to handle multiple power sources?
Sum total power first, then apply formulas with the combined power and appropriate current.
Does resistance change with temperature?
Yes — resistance can vary with temperature; use the resistance at operating temperature for best accuracy.
What is a quick example?
If a device uses 120 W at 2 A, voltage = 120 / 2 = 60 V.
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