1. What is the Power Formula?

The power formula (P = V × I) calculates electrical power in watts by multiplying voltage (V) by current (I). This simplified version is perfect for kids learning basic physics concepts about electricity.

2. How Does the Calculator Work?

The calculator uses the simple power equation:

Where:

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

Explanation: This shows how much electrical energy is being used per second. More voltage or more current means more power!

3. Importance of Power Calculation

Details: Understanding power helps us know how much electricity devices use, compare energy efficiency, and design safe electrical circuits.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both must be positive numbers. Try calculating power for different household devices!

5. Frequently Asked Questions (FAQ)

Q1: What's a real-world example?
A: A 9V battery with 0.5A current produces 4.5W of power (9 × 0.5 = 4.5).

Q2: What's the difference between watts and watt-hours?
A: Watts measure power at one moment, watt-hours measure energy used over time (like 60W bulb running for 1 hour = 60Wh).

Q3: Why do some devices use more power?
A: Devices needing more energy (like heaters) draw more current or use higher voltage, increasing power.

Q4: Is this the same as battery life?
A: Not directly - battery life depends on total energy (watt-hours) and how much power (watts) is being used.

Q5: What about AC vs DC?
A: For simple DC circuits (like batteries), this formula works perfectly. AC circuits need extra considerations.