1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It represents the amount of work done by electricity per unit time and is measured in watts (W).

2. How Does the Calculator Work?

The calculator uses the fundamental electrical power formula:

Where:

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

Explanation: This formula calculates the electrical power consumed or produced in a circuit by multiplying the voltage across the circuit by the current flowing through it.

3. Importance of Power Calculation

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

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between AC and DC power calculation?
A: For DC circuits, P = V × I directly. For AC circuits with resistive loads, it's the same, but with reactive loads, power factor must be considered.

Q2: How is power related to energy?
A: Power is the rate of energy consumption. Energy (in watt-hours) = Power (watts) × Time (hours).

Q3: What are typical power ratings for household appliances?
A: Common appliances range from 10W (LED bulb) to 2000W (electric heater). Always check manufacturer specifications.

Q4: Can this formula be used for three-phase systems?
A: For three-phase systems, the formula is P = √3 × V × I × PF, where PF is the power factor.

Q5: Why is power calculation important for electrical safety?
A: Knowing power consumption helps prevent circuit overloads, select proper wire sizes, and choose appropriate circuit breakers for safe operation.