Easily convert Amps to Volts using our free online calculator. Learn the Ohm’s Law formulas, view conversion tables, and understand the relationship between current, power, and voltage.
How to Convert Amps to Volts
In electrical engineering, you cannot convert Amps directly to Volts because they measure different things: Amps measure the flow of current, while Volts measure electrical potential. To calculate Voltage, you must use Ohm’s Law or the Power Law, which requires knowing either the resistance of the circuit or the total power consumption.
The Formula
Depending on what information you have available, use one of the two following formulas:
1. Using Power (Watts):Volts (V) = Watts (W) ÷ Amps (A)
2. Using Resistance (Ohms):Volts (V) = Amps (A) × Ohms (Ω)
Amps to Volts Conversion Table
This table shows the resulting Voltage for common Amperage levels, assuming a fixed resistance of 12 Ohms (a typical heating element) or a fixed power of 1200 Watts.
| Current (Amps) | At 12 Ohms (Ω) | At 1200 Watts (W) |
|---|---|---|
| 1 Amp | 12 Volts | 1200 Volts |
| 5 Amps | 60 Volts | 240 Volts |
| 10 Amps | 120 Volts | 120 Volts |
| 15 Amps | 180 Volts | 80 Volts |
| 20 Amps | 240 Volts | 60 Volts |
Contextual Information
Amps (Current): Amps represent the speed or volume of electricity flowing through a wire. Think of it like the volume of water flowing through a pipe.
Volts (Potential): Volts represent the electrical “pressure” that pushes the current through the circuit. In the water analogy, this is the water pressure.
Watts (Power): Watts are the total amount of energy being used. It is the result of Volts multiplied by Amps.
Common Real-World Examples
- Household Outlets (North America): Standard outlets are 120 Volts. If you plug in a 1200-Watt hair dryer, it draws 10 Amps of current.
- USB Charging: A standard USB-A charger provides 5 Volts. If it charges at 2 Amps, it is providing 10 Watts of power.
- Car Batteries: Most cars use 12-Volt systems. When starting a car, the starter motor can pull hundreds of Amps momentarily to turn the engine.
Disclaimer: When working with electricity, always consult with a licensed professional. Incorrectly calculating voltage for high-power applications can lead to equipment damage or safety hazards.