1. What is Power?

Power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and calculated as the product of voltage and current.

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: The equation shows the direct relationship between voltage, current, and power in an electrical circuit.

3. Importance of Power Calculation

Details: Calculating power consumption is essential for determining energy usage, sizing electrical components, and estimating operating costs of electrical devices.

4. Using the Calculator

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

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: How can I calculate energy consumption from power?
A: Multiply power (W) by time (hours) to get energy in watt-hours.

Q3: What are typical power ratings for household appliances?
A: LED bulbs: 5-20W, Laptop: 30-90W, Refrigerator: 100-400W, Microwave: 600-1200W.

Q4: Does this formula work for both AC and DC circuits?
A: For DC and purely resistive AC circuits, yes. For reactive AC loads, power factor must be considered.

Q5: How can I reduce power consumption?
A: Use more efficient devices, reduce operating time, or lower voltage/current where possible.