1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It represents how much work can be done by the electrical system per unit time and is measured in watts.

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, sizing components, and ensuring safety in electrical installations.

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 units are used for power calculation?
A: Power is measured in watts (W), which is equivalent to joules per second.

Q2: Can this formula be used for AC circuits?
A: For DC circuits, P = V × I applies directly. For AC circuits with resistive loads, it also applies using RMS values of voltage and current.

Q3: How does power relate to energy consumption?
A: Energy consumption is power multiplied by time (E = P × t), typically measured in watt-hours or kilowatt-hours.

Q4: What is the difference between power and energy?
A: Power is the rate of energy transfer (watts), while energy is the total amount of work done (watt-hours).

Q5: Why is power calculation important for battery systems?
A: Power calculation helps determine battery capacity requirements, runtime, and appropriate sizing for specific applications.