1. What is the DC Motor Power Equation?

The DC motor power equation (P = V × I) calculates the electrical power input to a DC motor based on voltage and current. This fundamental relationship helps in understanding motor performance and energy requirements.

2. How Does the Calculator Work?

The calculator uses the basic power equation:

Where:

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

Explanation: The equation shows the direct relationship between voltage and current in determining the power consumption of a DC motor.

3. Importance of Power Calculation

Details: Calculating motor power is essential for proper motor selection, circuit design, and energy efficiency calculations. It helps determine if a power supply can adequately drive a motor.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers. The calculator will compute the power in watts.

5. Frequently Asked Questions (FAQ)

Q1: Is this the mechanical or electrical power?
A: This calculates the electrical input power. Mechanical output power would be less due to efficiency losses.

Q2: Does this work for AC motors?
A: No, AC motor power calculation requires considering power factor (P = V × I × PF).

Q3: What's typical voltage for DC motors?
A: Common voltages include 6V, 12V, 24V, 48V, but can range from 1.5V to hundreds of volts.

Q4: How does this relate to motor torque?
A: Mechanical power (torque × speed) is related to electrical power through motor efficiency.

Q5: What if I only know resistance?
A: You can use P = V²/R or P = I²R if you know resistance instead of both V and I.