1. What is the Voltage Equation?

The voltage equation (V = P/I) calculates the electrical potential difference (voltage) when you know the power in watts and the current in amperes. This is derived from the fundamental electrical power formula P = VI.

2. How Does the Calculator Work?

The calculator uses the voltage equation:

Where:

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

Explanation: The equation shows that voltage is directly proportional to power and inversely proportional to current.

3. Importance of Voltage Calculation

Details: Calculating voltage is essential for designing electrical circuits, selecting appropriate components, and ensuring safe operation of electrical devices.

4. Using the Calculator

Tips: Enter power in watts and current in amperes. Both values must be positive numbers. The calculator will compute the voltage in volts.

5. Frequently Asked Questions (FAQ)

Q1: What if I know voltage and want to find power?
A: Use P = V × I. Multiply voltage by current to get power in watts.

Q2: What are typical voltage values in household circuits?
A: In most countries, household circuits are either 120V or 230V, though specific appliances may use different voltages.

Q3: Does this equation work for both AC and DC?
A: For DC circuits, yes. For AC circuits, this gives the magnitude but doesn't account for phase differences between voltage and current.

Q4: What are the units for this calculation?
A: Power must be in watts, current in amperes, and the result will be in volts.

Q5: Can I use this for three-phase power calculations?
A: For three-phase systems, you'll need to include the power factor (for AC) and possibly the √3 factor for line-to-line voltages.