1. What is Ohm's Power Equation?

The Ohm's Power equation calculates the electrical power dissipated in a resistor using the voltage across it and its resistance. It's derived from combining Ohm's Law with the basic power formula.

2. How Does the Calculator Work?

The calculator uses the Ohm's Power equation:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( R \) — Resistance in ohms (Ω)

Explanation: The power dissipated in a resistor increases with the square of the voltage and decreases with higher resistance.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical circuits, selecting appropriate components, and ensuring safety by preventing overheating.

4. Using the Calculator

Tips: Enter voltage in volts and resistance in ohms. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between this and P = IV?
A: Both calculate power, but P = V²/R is specifically for resistive loads when you know voltage and resistance but not current.

Q2: Can I use this for AC circuits?
A: Yes, but you must use RMS voltage values for AC circuits.

Q3: What happens if resistance is zero?
A: The equation becomes undefined (division by zero), representing a short circuit scenario.

Q4: How does power relate to heat?
A: The power calculated represents the heat energy dissipated by the resistor per second.

Q5: What if my resistor can't handle the calculated power?
A: You should select a resistor with a higher power rating to avoid overheating and failure.