1. What is Motor Current Calculation?

The motor current calculation estimates the electrical current drawn by a motor based on its power rating and the supply voltage. This is essential for proper circuit design and protection.

2. How Does the Calculator Work?

The calculator uses the single phase approximation formula:

Where:

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

Explanation: The formula converts kW to watts (×1000) then divides by voltage to get current.

3. Importance of Current Calculation

Details: Accurate current calculation is crucial for selecting proper wire sizes, circuit breakers, and overload protection for motor circuits.

4. Using the Calculator

Tips: Enter power in kW and voltage in V. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula accurate for three-phase motors?
A: No, this is for single-phase only. Three-phase requires additional factors (√3 and power factor).

Q2: What's a typical current for a 1kW motor?
A: At 230V, about 4.35A. At 120V, about 8.33A (using this formula).

Q3: Why multiply by 1000 in the formula?
A: To convert kilowatts (kW) to watts (W) since 1 kW = 1000 W.

Q4: Does this account for motor efficiency?
A: No, this is a simplified calculation that assumes 100% efficiency.

Q5: When should I use a more precise calculation?
A: For critical applications or three-phase systems, use more detailed formulas that include power factor and efficiency.