1. What is the Voltage Formula?

The voltage formula V = P / I calculates electrical voltage from power and current. This is derived from the fundamental electrical relationship where power equals voltage multiplied by current (P = V × I).

2. How Does the Calculator Work?

The calculator uses the voltage formula:

Where:

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

Explanation: This formula rearranges the standard power equation to solve for voltage when power and current are known.

3. Importance of Voltage Calculation

Details: Accurate voltage calculation is essential for electrical circuit design, power system analysis, equipment specification, and troubleshooting electrical systems.

4. Using the Calculator

Tips: Enter power in watts and current in amperes. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the units for each variable?
A: Voltage is measured in volts (V), power in watts (W), and current in amperes (A).

Q2: Can this formula be used for both AC and DC circuits?
A: For DC circuits, this formula applies directly. For AC circuits, it applies to resistive loads where power factor is 1.

Q3: What is the relationship between these electrical quantities?
A: Power equals voltage multiplied by current (P = V × I), so voltage equals power divided by current (V = P / I).

Q4: Are there any limitations to this calculation?
A: This calculation assumes purely resistive loads. For reactive loads (inductive or capacitive), power factor must be considered.

Q5: What are typical voltage values in electrical systems?
A: Common voltages include 120V/240V (residential), 480V (commercial), and various DC voltages for electronic devices.