1. What is DC Motor Power?

DC motor power represents the rate at which electrical energy is converted to mechanical energy. It's a fundamental parameter for motor selection and performance evaluation.

2. How Does the Calculator Work?

The calculator uses the basic power formula:

Where:

• \( P \) — Power in Watts (W)
• \( V \) — Voltage in Volts (V)
• \( I \) — Current in Amperes (A)

Explanation: This formula calculates the electrical power input to the motor. The actual mechanical power output will be less due to efficiency losses.

3. Importance of Power Calculation

Details: Accurate power calculation helps in selecting appropriate motor size, determining electrical requirements, and evaluating system efficiency.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers. For best results, measure voltage under load conditions.

5. Frequently Asked Questions (FAQ)

Q1: Is this the input or output power?
A: This calculates electrical input power. Output mechanical power would be less due to efficiency losses (typically 70-90% for DC motors).

Q2: How does this relate to motor torque?
A: Mechanical power (output) relates to torque (τ) and angular velocity (ω) by P = τ × ω. The electrical power calculated here is the input to achieve that.

Q3: What about AC motors?
A: AC motor power calculation requires considering power factor. This simple formula only applies to DC circuits.

Q4: Why might my actual power differ?
A: Variations can occur due to voltage drops, brush resistance, or measurement inaccuracies. Always measure under operating conditions.

Q5: How does this help with motor selection?
A: Knowing power requirements helps select a motor with appropriate wattage rating and ensures your power supply can deliver sufficient current.