1. What is a Watts to Amperage Calculator?

Definition: This calculator determines the electrical current (amperage) based on power in watts and voltage.

Purpose: It helps electricians, engineers, and DIYers calculate current draw for electrical systems and devices.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

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

Explanation: The power in watts is divided by 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 electrical overloads.

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's the difference between AC and DC in this calculation?
A: The basic formula works for both, but for AC circuits with reactive loads, power factor must be considered.

Q2: What voltage should I use for household calculations?
A: In the US, use 120V for standard outlets and 240V for large appliances. Other countries may use 230V.

Q3: How does this relate to circuit breaker sizing?
A: The calculated amperage helps determine appropriate circuit breaker size (typically 125% of continuous load current).

Q4: Can I calculate power if I know current and voltage?
A: Yes, use P = V × I. We have a separate Amps to Watts calculator for this purpose.

Q5: Why is my actual current draw different?
A: Actual current may vary due to power factor (AC circuits), efficiency losses, or voltage fluctuations.