Volts (V) to Amps (A) Converter

What Is a Volts (V)?

A volt (V) measures electrical voltage, or the push that moves charge through a circuit. Voltage shows the potential difference between two points. Common values include 12 V, 120 V, and 240 V. You need voltage plus power or resistance to calculate current.

What Is a Amps (A)?

An amp (A), short for ampere, measures electric current. It shows how much charge flows through a circuit each second. Current depends on voltage, resistance, power, and the circuit load. A higher current means more charge flows through the circuit each second.

How to Convert Volts (V) to Amps (A) manually?

To convert volts to amps, you need power in watts when the load has a known power rating. Voltage alone cannot give current because the load affects the result. This method works for a known power value.

Formula

$I = P / V$

Step by step Guide

1. Enter power in watts.
2. Enter voltage in volts.
3. Divide watts by volts.
4. Record the result in amps.

Practical Example

For 240 W at 120 V, $I = 240 / 120 = 2 A$. This means the load draws 2 amps.

Convert Volts to Amps using Resistance

Use resistance when you know voltage and resistance instead of power. Ohm’s Law gives current from these two values. Resistance measures how strongly a load opposes current flow, so the result depends on both voltage and resistance.

Formula

$I = V / R$

Step by step Guide

1. Enter voltage in volts.
2. Enter resistance in ohms.
3. Divide voltage by resistance.
4. Record the result in amps.

Practical Example

For 120 V across 30 Ω, $I = 120 / 30 = 4 A$. This means the circuit carries 4 amps.

Volts to Amps for AC and DC Circuits

The volts to amps formula depends on the circuit and the values you know. For DC circuits, use power or resistance. AC circuits may need RMS voltage and power factor for current results.

DC Volts to Amps

For DC power, use $I = P / V$. With resistance, use $I = V / R$. These formulas work when the stated values match the circuit.

AC Volts to Amps

For a simple resistive AC load, use RMS values. With real power and power factor, single phase current can use $I = P / (V × PF)$. Check the circuit type before using this formula.

Ohm’s law:

Ohm’s Law connects voltage, current, and resistance in an electrical circuit. Use $I = V / R$ when voltage and resistance are known. Here, $I$ represents amps, $V$ represents volts, and $R$ represents resistance in ohms.

Volts (V) to Amps (A) Conversion Chart

Note: This chart assumes a constant 240 W load. Actual amps change when power or resistance changes, so use your real load values for an accurate result.

Can You Convert Volts to Amps Without Resistance?

No. You cannot find amps from voltage alone. You also need power, resistance, or another value that defines the load. Use $I = P / V$ when you know watts. Use $I = V / R$ when you know resistance. The calculator needs enough information to determine current safely.