1. What is a Watts Calculator from Volts and Resistance?

Definition: This calculator determines the power in watts based on voltage and resistance using Ohm's Law.

Purpose: It helps electrical engineers, technicians, and hobbyists calculate power dissipation in circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The voltage squared is divided by the resistance to calculate the power dissipation in a circuit.

3. Importance of Power Calculation

Details: Proper power calculation ensures components are properly sized, prevents overheating, and helps design efficient electrical systems.

4. Using the Calculator

Tips: Enter the voltage in volts and resistance in ohms. Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What's the relationship between power, voltage and resistance?
A: Power increases with the square of voltage and decreases with higher resistance.

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

Q3: What happens if resistance is zero?
A: The formula would give infinite power, which is impossible in real circuits (short circuit condition).

Q4: How does this relate to Ohm's Law?
A: This is one of the power formulas derived from Ohm's Law (P = V²/R = I²R = VI).

Q5: When would I need this calculation?
A: When designing circuits, selecting resistors, or determining power supply requirements.