1. What is a Watts Calculator?

Definition: This calculator computes electrical power in watts based on voltage and current.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( W \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: The voltage is multiplied by the current to calculate the power in watts.

3. Importance of Watts Calculation

Details: Proper power calculation ensures correct sizing of electrical components, safety compliance, and energy efficiency.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amperes. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between watts and volt-amps?
A: Watts represent real power, while volt-amps represent apparent power. They're equal in DC circuits or AC circuits with purely resistive loads.

Q2: Can I calculate watts from resistance?
A: Yes, using \( W = V^2/R \) or \( W = I^2 \times R \) where R is resistance in ohms.

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

Q4: How do I find current if I know watts and voltage?
A: Use \( I = W/V \).

Q5: Does this work for both AC and DC circuits?
A: For DC and AC with purely resistive loads. For reactive AC loads, power factor must be considered.