1. What is a Watts Calculator?

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

Purpose: It helps electricians, engineers, and DIY enthusiasts calculate power consumption or generation in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: Power is calculated by multiplying the voltage across a component by the current flowing through it.

3. Importance of Power Calculation

Details: Understanding power consumption helps in sizing electrical components, calculating energy usage, and ensuring circuit safety.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What if I know resistance instead of current?
A: You can use \( P = V^2 / R \) or \( P = I^2 \times R \) if you know resistance (R).

Q2: Does this work for both AC and DC circuits?
A: This formula works for DC circuits. For AC, you need to consider power factor (cos φ).

Q3: What's a typical household voltage?
A: In North America, 120V for most outlets and 240V for large appliances. Europe uses 230V.

Q4: How do I measure current safely?
A: Use a multimeter set to measure amperage in series with the circuit (with proper safety precautions).

Q5: What can I calculate with power values?
A: You can determine energy consumption (kWh), size circuit breakers, or calculate operating costs.