1. What is Current Calculation from Watts?

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

Purpose: It helps electricians, engineers, and DIY enthusiasts calculate current draw for electrical circuits 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 the voltage in volts to determine the current in amperes.

3. Importance of Current Calculation

Details: Proper current calculation ensures correct wire sizing, circuit breaker selection, and prevents electrical hazards.

4. Using the Calculator

Tips: Enter the power in watts and voltage in volts (default 120V). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC in this calculation?
A: For resistive loads, the calculation is the same. For reactive loads in AC, power factor must be considered.

Q2: What's a typical household voltage?
A: In North America, 120V is standard for most circuits, while 240V is used for large appliances.

Q3: How do I find the power rating of a device?
A: Check the device's specification label or manual for wattage information.

Q4: Why is my calculated current higher than expected?
A: This could indicate a power factor issue (for AC) or incorrect power/voltage values.

Q5: How does this relate to circuit breaker sizing?
A: Circuit breakers should be sized to handle at least 125% of the continuous current calculated.