1. What is a Power Calculator from Voltage and Current?

Definition: This calculator computes electrical power based on voltage and current values.

Purpose: It helps electricians, engineers, and hobbyists determine the power consumption or generation in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the fundamental power formula:

Where:

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

Explanation: The voltage (potential difference) multiplied by the current (electron flow) gives the power (energy per unit time).

3. Importance of Power Calculation

Details: Accurate power calculations are essential for circuit design, energy efficiency, and safety in electrical systems.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC in this calculation?
A: For DC circuits, use the simple formula. For AC, you need to consider power factor (cos φ) for accurate results.

Q2: How do I measure voltage and current?
A: Use a multimeter - connect in parallel for voltage, in series for current measurements.

Q3: What if I know resistance instead of current?
A: Use Ohm's Law (I = V/R) first to find current, then calculate power.

Q4: Can this calculate power in kilowatts?
A: Yes, just divide the result by 1000 to convert watts to kilowatts.

Q5: Does this work for three-phase systems?
A: For three-phase, you'll need to include the √3 factor (P = √3 × V × I × pf).