1. What is an Ohm's Law Power Calculator?

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

Purpose: It helps electricians, engineers, and hobbyists calculate power consumption in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Power Calculation

Details: Proper power calculation ensures circuit 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. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What if I know current instead of voltage?
A: Use the alternative formula P = I² × R where I is current in amps.

Q2: What's a typical resistance value?
A: Resistance varies widely by component - from milliohms in wires to megaohms in insulators.

Q3: Does this work for AC and DC circuits?
A: For DC circuits, use the values directly. For AC, use RMS values.

Q4: How does power relate to heat?
A: Power in watts directly relates to heat generation - 1 watt = 1 joule/second.

Q5: What about power factor in AC circuits?
A: This calculator shows real power. For AC circuits with reactive components, apparent power would be higher.