1. What is Power?

Power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (W), which is equal to one joule per second.

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 power in an electrical circuit is equal to the voltage multiplied by the current.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical systems, determining battery life, sizing components, and ensuring safe operation of electrical devices.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. All values must be valid (greater than 0). The result will be displayed 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: How does this relate to battery capacity?
A: Battery capacity is typically measured in watt-hours (Wh), which is power (W) multiplied by time (hours).

Q3: Can I use this for AC circuits?
A: This simple formula works for DC circuits. For AC, you need to consider power factor for accurate calculations.

Q4: What are typical power ratings for household devices?
A: Small electronics might use 5-50W, while appliances like microwaves use 600-1200W.

Q5: How can I calculate battery life from this?
A: Divide battery capacity (Wh) by power consumption (W) to get runtime in hours.