1. What is Electric Horsepower?

Electric horsepower is a measure of the power output of an electric motor, calculated from the voltage, current, and efficiency of the motor. One horsepower is equivalent to 746 watts.

2. How Does the Calculator Work?

The calculator uses the electric horsepower formula:

Where:

• \( Volts \) — Electrical potential difference (volts)
• \( Amps \) — Electrical current (amperes)
• \( Efficiency \) — Motor efficiency (decimal between 0 and 1)
• 746 — Conversion factor from watts to horsepower

Explanation: The formula calculates the mechanical power output of an electric motor based on its electrical input and efficiency.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation is crucial for selecting appropriate motors for applications, determining electrical requirements, and ensuring proper system design.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, and motor efficiency as a decimal (e.g., 85% = 0.85). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical efficiency value for electric motors?
A: Standard efficiency ranges from 0.75 to 0.95 (75% to 95%). Premium efficiency motors are typically 0.90 or higher.

Q2: Why divide by 746?
A: 746 watts equals 1 horsepower, so this converts electrical power (watts) to mechanical power (horsepower).

Q3: Does this work for three-phase motors?
A: For three-phase motors, you need to include the power factor and multiply by √3 (1.732) in the calculation.

Q4: What's the difference between input and output horsepower?
A: Input HP is electrical power, output HP is mechanical power after accounting for efficiency losses.

Q5: How accurate is this calculation?
A: It provides a good estimate for steady-state operation but doesn't account for startup currents or variable loads.