1. What is a Wattage to Amperage Calculator?

Definition: This calculator converts electrical power in watts to current in amperes using the voltage.

Purpose: It helps electricians, engineers, and DIY enthusiasts determine the current draw of electrical devices.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The power in watts is divided by the voltage to determine the current flow in amperes.

3. Importance of Current Calculation

Details: Proper current calculation ensures safe circuit design, proper wire sizing, and prevents overloading electrical systems.

4. Using the Calculator

Tips: Enter the power in watts and voltage (default 120V for standard US household current). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What voltage should I use for household appliances?
A: In the US, use 120V for standard outlets and 240V for large appliances. Check local standards for other countries.

Q2: Does this work for DC and AC circuits?
A: Yes, for DC and pure resistive AC loads. For reactive AC loads, power factor must be considered.

Q3: How do I find the wattage of a device?
A: Check the device label or specifications. For simple devices: watts = volts × amps.

Q4: Why is my circuit breaker tripping?
A: If the calculated current exceeds your circuit's rating (typically 15-20 amps for US household circuits), it may trip the breaker.

Q5: What's the difference between real power and apparent power?
A: This calculator uses real power (watts). For AC circuits with motors or transformers, apparent power (VA) may be higher.