1. What is a Voltage Calculator from Watts?

Definition: This calculator estimates the voltage based on power in watts and current in amperes.

Purpose: It helps electrical engineers, technicians, and hobbyists determine voltage when power and current are known.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Voltage (volts)
• \( P \) — Power (watts)
• \( I \) — Current (amps)

Explanation: The power is divided by current to calculate the voltage in a DC circuit or the RMS voltage in an AC circuit.

3. Importance of Voltage Calculation

Details: Proper voltage calculation ensures correct circuit design, component selection, and safety in electrical systems.

4. Using the Calculator

Tips: Enter the power in watts and current in amps. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Does this formula work for AC circuits?
A: Yes, when using RMS values for power and current in purely resistive AC circuits.

Q2: What if my current is zero?
A: Current cannot be zero in this calculation as it would result in division by zero.

Q3: How accurate is this calculation?
A: It's mathematically precise for DC circuits and resistive AC loads. For reactive loads, power factor must be considered.

Q4: Can I calculate power if I know voltage and current?
A: Yes, using P = V × I. We have a separate calculator for that calculation.

Q5: What's the typical voltage in household circuits?
A: In North America, typically 120V or 240V. In Europe, typically 230V.