1. What is DC Motor Power?

DC motor power is the rate at which electrical energy is converted to mechanical energy. It's calculated by multiplying the voltage applied to the motor by the current flowing through it.

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

3. Importance of Power Calculation

Details: Calculating motor power helps in selecting the right motor for an application, determining energy consumption, and ensuring proper power supply sizing.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Is this calculation accurate for all DC motors?
A: This gives the electrical input power. Mechanical output power will be less due to efficiency losses.

Q2: What's the difference between input and output power?
A: Input power is electrical (V×I), output power is mechanical (torque×speed). The difference is due to motor efficiency.

Q3: How does motor efficiency affect power?
A: Efficiency = (Output Power / Input Power) × 100%. Typical DC motors are 70-85% efficient.

Q4: Can I use this for AC motors?
A: No, AC motor power calculation requires considering power factor (P = V×I×PF for single-phase).

Q5: What if I only know resistance?
A: Power can also be calculated as P = I²×R or P = V²/R using Ohm's Law.