1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. It's a fundamental concept in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses the basic power equation:

Where:

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

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

3. Importance of Power Calculation

Details: Calculating electrical power is essential for designing electrical systems, determining energy consumption, sizing components, and ensuring electrical safety.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers. The calculator will compute the power in watts.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between power and energy?
A: Power is the rate of energy transfer (watts), while energy is power multiplied by time (watt-hours).

Q2: Can I calculate power for AC circuits with this?
A: This simple formula works for DC circuits. For AC, you need to consider power factor (P = V × I × PF).

Q3: What are typical household appliance power ratings?
A: LED bulb: 5-15W, Laptop: 50W, Microwave: 800-1500W, Refrigerator: 100-400W.

Q4: How does power relate to heat generation?
A: Power dissipation in resistors converts to heat (P = I²R), important for component sizing and cooling.

Q5: What's the relationship between power and battery life?
A: Battery life (hours) = Battery capacity (Wh) / Power consumption (W).