Volts to amps calculator

Understanding how (V) volts and (A) amps relate is essential for working with electrical systems. Whether you’re dealing with single-phase or three-phase power, this guide explains the basics and provides formulas to calculate amps when voltage, power, or resistance is known.

What Are Volts and Amps?

• Volts (V): Measure the electrical force that drives current through a circuit.
• Amps (A): Measure the flow of electric current in a circuit.

Single-Phase Power: Volts to Amps

In single-phase systems, the formulas are straightforward:

1. Using Power (Watts):

   $$\text{Amps} = \frac{\text{Watts}}{\text{Volts}}$$

2. Using Resistance (Ohms):

   $$\text{Amps} = \frac{\text{Volts}}{\text{Ohms}}$$

Example:
A 60-watt device operating at 12 volts:

$$\text{Amps} = \frac{60}{12} = 5 \, \text{A}$$

Three-Phase Power: Volts to Amps

Three-phase power systems are common in industrial and commercial settings. These systems require slightly different formulas depending on the connection type:

For Three-Phase Systems Using Power (Watts):

1. Line-to-Line Voltage (VL-L):

   $$\text{Amps} = \frac{\text{Watts}}{\sqrt{3} \times \text{Volts} \times \text{Power Factor}}$$

2. Line-to-Neutral Voltage (VL-N):

   $$\text{Amps} = \frac{\text{Watts}}{3 \times \text{Volts} \times \text{Power Factor}}$$

Example:
If a three-phase motor consumes 10,000 watts, operates at 400 volts (line-to-line), and has a power factor of 0.8:

$$\text{Amps} = \frac{10,000}{\sqrt{3} \times 400 \times 0.8} \approx 18.04 \, \text{A}$$

For Three-Phase Systems Using Resistance (Ohms):

$$\text{Amps} = \frac{\text{Volts}}{\text{Ohms}}$$

This formula is identical to single-phase systems but considers three-phase resistance.

Why Does This Matter?

Knowing how to convert volts to amps is crucial for:

• Ensuring proper wire and breaker sizing.
• Avoiding overloads in three-phase systems.
• Designing and maintaining electrical equipment.

Use a Volts to Amps Calculator (Single-Phase & Three-Phase)

Manually calculating amps for three-phase systems can involve multiple steps. Our Volts to Amps Calculator simplifies the process. It supports single-phase and three-phase systems, letting you calculate current quickly and accurately.