1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and represents how much work can be done by the electrical current in a given time.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: This fundamental equation shows that power is directly proportional to both voltage and current in an electrical circuit.

3. Importance of Power Calculation

Details: Calculating electrical power is essential for designing electrical systems, determining energy consumption, selecting appropriate components, and ensuring electrical safety in various applications.

4. Using the Calculator

Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers to calculate the power output.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between AC and DC power calculations?
A: For DC circuits, P = V × I is straightforward. For AC circuits, power factor must be considered: P = V × I × PF (where PF is power factor).

Q2: How is electrical power related to energy consumption?
A: Energy consumption is power multiplied by time (E = P × t). Power measured in watts, energy in watt-hours.

Q3: Can this formula be used for three-phase systems?
A: For balanced three-phase systems, power is calculated as P = √3 × V × I × PF, where V is line voltage and I is line current.

Q4: What are typical power ratings for household appliances?
A: Common appliances range from 5W (LED bulb) to 3000W (electric heater). Knowing power helps determine circuit requirements and energy costs.

Q5: How does resistance relate to power?
A: Using Ohm's Law (V = I × R), power can also be calculated as P = I² × R or P = V² / R, useful when resistance is known instead of voltage or current.