1. What is the Power Formula?

Definition: This calculator computes electrical power in watts using voltage and current values.

Purpose: It helps electricians, engineers, and students 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 (amperes)

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 analysis, and electrical safety.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between real power and apparent power?
A: This calculator gives real power (in watts). Apparent power (in VA) would require considering power factor in AC circuits.

Q2: Can I use this for both AC and DC circuits?
A: For DC circuits, yes. For AC circuits, this gives real power only when voltage and current are in phase (power factor = 1).

Q3: What are typical household voltage values?
A: In North America, 120V for most outlets and 240V for large appliances. Europe uses 230V standard.

Q4: How does power relate to energy?
A: Power is the rate of energy use. Energy (watt-hours) = Power (watts) × Time (hours).

Q5: What if I know resistance instead of current?
A: Use P = V²/R or P = I²R formulas instead, depending on what values you know.