1. What is a Wattage Calculator?

Definition: This calculator computes electrical power (wattage) from voltage and current measurements.

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:

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

Explanation: This is the fundamental power formula in DC circuits and AC circuits with purely resistive loads.

3. Importance of Wattage Calculation

Details: Proper wattage calculation ensures electrical systems are properly sized, circuits aren't overloaded, and energy consumption is accurately estimated.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. Both values must be > 0. For AC circuits with reactive components, additional factors may be needed.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula the same for AC and DC?
A: For DC and purely resistive AC circuits, yes. For AC with inductive or capacitive loads, you need to include power factor.

Q2: What's a typical household voltage?
A: In North America, 120V is standard for most outlets, while Europe uses 230V. Large appliances may use 240V.

Q3: How do I measure current safely?
A: Use a multimeter with proper current measurement capabilities and follow all electrical safety precautions.

Q4: Can I calculate current if I know wattage and voltage?
A: Yes, rearrange the formula: \( I = \frac{P}{V} \).

Q5: What about three-phase power?
A: Three-phase power uses a different formula: \( P = \sqrt{3} \times V \times I \times PF \) where PF is power factor.