Amps to Volts Calculator

Convert amps to volts using Ohm's Law (with resistance) or Watt's Law (with power). Essential for circuit design, troubleshooting, and understanding electrical relationships.

CONVERSION METHOD

⚡ CURRENT (AMPS)

🔧 RESISTANCE

VOLTAGE

120 V

KILOVOLTS

0.12 kV

METHOD

Ohm's Law

FORMULA

V = I × R

Amps to Volts using Resistance — Reference Table

Amps	4 Ω	8 Ω	12 Ω	16 Ω
1 A	4 V	8 V	12 V	16 V
2 A	8 V	16 V	24 V	32 V
5 A	20 V	40 V	60 V	80 V
10 A	40 V	80 V	120 V	160 V
15 A	60 V	120 V	180 V	240 V
20 A	80 V	160 V	240 V	320 V
30 A	120 V	240 V	360 V	480 V
50 A	200 V	400 V	600 V	800 V

💡 How to Convert Amps to Volts

Converting amps (current) to volts (voltage) requires a second known quantity — either resistance (ohms) or power (watts). This calculator supports both methods.

Method 1: Using Resistance (Ohm's Law)

V = I × R

Where V is voltage (volts), I is current (amps), R is resistance (ohms).

Ohm's Law is the most fundamental equation in electrical engineering, published by Georg Simon Ohm in 1827. It states that voltage across a conductor is directly proportional to current flowing through it.

Method 2: Using Power (Watt's Law)

V = P / I

Where V is voltage (volts), P is power (watts), I is current (amps).

Example: Finding Voltage with Ohm's Law

A circuit draws 15 amps through an 8-ohm load:
V = 15A × 8Ω = 120 volts

The Ohm's Law Triangle

Remember the three forms of Ohm's Law:

V = I × R — Find voltage when you know current and resistance
I = V / R — Find current when you know voltage and resistance
R = V / I — Find resistance when you know voltage and current

References

Fundamentals of Electric Circuits — Sadiku & Alexander, 7th Edition
NFPA 70 — National Electrical Code (NEC), 2023 Edition

15 amps × 8 ohms = 120 volts (Ohm's Law). This calculator supports both Ohm's Law (resistance) and Watt's Law (power) methods.