1. What is a kW to Amperage Calculator?

Definition: This calculator converts electrical power in kilowatts (kW) to current in amperes (A) using the circuit voltage.

Purpose: It helps electricians, engineers, and DIYers determine the current draw of electrical equipment based on its power rating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current in amperes (A)
• \( kW \) — Power in kilowatts (kW)
• \( V \) — Voltage in volts (V)

Explanation: The power in kW is converted to watts (by multiplying by 1000) and then divided by voltage to get current.

3. Importance of Current Calculation

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

4. Using the Calculator

Tips: Enter the power in kW and the circuit voltage (default 120V for standard US circuits). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between kW and kVA?
A: kW is real power, while kVA is apparent power. For purely resistive loads (like heaters), they're equal. For motors, kW is typically 80% of kVA.

Q2: What voltage should I use?
A: Common voltages are 120V (US residential), 230V (EU residential), 208V/240V (US appliances), or 480V (industrial).

Q3: Does this work for three-phase systems?
A: This is for single-phase. Three-phase requires multiplying by √3 (1.732) in the denominator.

Q4: Why multiply kW by 1000?
A: To convert kilowatts to watts (1 kW = 1000 watts) since voltage is in volts and current in amps.

Q5: How accurate is this calculation?
A: It's theoretically precise for DC or purely resistive AC circuits. For inductive loads, power factor affects actual current.