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

Definition: This calculator computes electrical power in watts using voltage and resistance values.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Power Calculation

Details: Proper power calculation ensures components are not overloaded, helps design efficient circuits, and prevents overheating.

4. Using the Calculator

Tips: Enter the voltage in volts and resistance in ohms. Both values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What happens if resistance is very low?
A: Very low resistance with significant voltage will result in very high power, potentially causing component failure.

Q2: Does this work for AC and DC circuits?
A: This formula works for DC circuits. For AC, use RMS voltage values.

Q3: What's a typical resistance value?
A: Resistance values vary widely depending on the component - from milliohms to megaohms.

Q4: How is this different from P=IV?
A: Both calculate power, but this version uses voltage and resistance instead of voltage and current.

Q5: What if I only know current and resistance?
A: Use P = I²R where I is current in amps.