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

Definition: This calculator computes electrical power based on voltage and current values using Ohm's Law.

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 formula:

Where:

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

Explanation: The voltage is multiplied by the current to calculate the power in watts.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for circuit design, energy efficiency, and electrical safety.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. All values must be > 0.

5. Frequently Asked Questions (FAQ)

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

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

Q3: What's a typical household voltage?
A: In North America it's 120V, while many other countries use 230V as standard.

Q4: Can I calculate current if I know power and voltage?
A: Yes, rearrange the formula: \( I = \frac{P}{V} \)

Q5: What about three-phase power calculations?
A: Three-phase power requires multiplying by √3 (about 1.732) and power factor.