1. What is DC Motor Current?

The DC motor current is the amount of electric current drawn by a DC motor when operating under a specific power and voltage. It's a crucial parameter for selecting proper wiring, fuses, and power supplies.

2. How Does the Calculator Work?

The calculator uses Ohm's Law for power:

Where:

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

Explanation: This simple formula shows the direct relationship between power, voltage, and current in a DC circuit.

3. Importance of Current Calculation

Details: Knowing the current draw is essential for proper circuit design, preventing overheating, and ensuring the power supply can handle the motor's requirements.

4. Using the Calculator

Tips: Enter the motor's rated power in watts and operating voltage in volts. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula valid for AC motors?
A: No, this simple formula only works for DC motors. AC motor current calculation requires power factor consideration.

Q2: What if my motor efficiency isn't 100%?
A: For more accurate results, use the mechanical power output divided by efficiency: \( I = \frac{P}{\eta \times V} \), where η is efficiency.

Q3: How does starting current differ?
A: Starting current (inrush current) is typically much higher (5-7x) than running current but lasts only briefly.

Q4: What wire gauge should I use?
A: Wire gauge depends on current and length. Use the National Electrical Code (NEC) tables for proper sizing.

Q5: Can I use this for battery sizing?
A: Yes, knowing current helps estimate battery life: \( \text{Hours} = \frac{\text{Ah rating}}{I} \).