1. What is a Wattage Calculator?

Definition: This calculator computes electrical power (wattage) using Ohm's law based on voltage and current inputs.

Purpose: It helps electricians, engineers, and DIY enthusiasts determine the power consumption or generation of electrical devices.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Wattage Calculation

Details: Proper wattage calculation ensures correct circuit sizing, energy efficiency, and electrical safety in both residential and industrial applications.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. Both values must be greater than 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: How do I calculate wattage for three-phase systems?
A: For three-phase, use \( W = V \times A \times \sqrt{3} \times PF \) where PF is power factor.

Q3: What's a typical household voltage?
A: In North America it's 120V for most circuits, 240V for large appliances. Elsewhere, 230V is common.

Q4: How does wattage relate to energy consumption?
A: Energy (kWh) = Power (kW) × Time (hours). Wattage shows instantaneous power draw.

Q5: Can I calculate current if I know wattage and voltage?
A: Yes, use \( A = W / V \). Our calculator can be used in reverse this way.