1. What is the Voltage Formula?

The voltage formula (V = P/I) calculates the electrical potential difference (voltage) between two points in a circuit when you know the power and current. It's derived from the fundamental relationship between power, voltage, and current in electrical systems.

2. How Does the Calculator Work?

The calculator uses the voltage formula:

Where:

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

Explanation: This formula shows that voltage is directly proportional to power and inversely proportional to current in a DC circuit or in the instantaneous power of an AC circuit.

3. Importance of Voltage Calculation

Details: Calculating voltage is essential for designing electrical circuits, selecting appropriate components, ensuring safety, and troubleshooting electrical systems. It helps determine if a circuit is operating within its designed parameters.

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: Can this formula be used for AC circuits?
A: For AC circuits, this gives the magnitude of voltage when using RMS values for power and current, but doesn't account for phase differences.

Q2: What are typical voltage values in household circuits?
A: In most countries, household voltage is either 120V or 230V, though actual values may vary slightly.

Q3: Why does voltage drop occur in circuits?
A: Voltage drops occur due to resistance in conductors, leading to power loss (often as heat) according to Ohm's Law.

Q4: How does this relate to Ohm's Law?
A: Combining V = P/I with Ohm's Law (V = I×R) allows calculation of resistance when power and current are known.

Q5: What's the difference between voltage and potential difference?
A: In practical terms, they're often used interchangeably, though voltage specifically refers to potential difference measured in volts.