1. What is Horsepower Calculation from Volts and Amps?

Definition: This calculator estimates the mechanical power output (horsepower) of an AC motor based on electrical input parameters.

Purpose: It helps engineers, electricians, and technicians determine motor performance and power requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower (mechanical power output)
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• \( \eta \) — Motor efficiency (0-1)
• \( PF \) — Power factor (0-1)
• 746 — Conversion factor (watts to horsepower)

Explanation: The formula converts electrical power (adjusted for efficiency and power factor) to mechanical horsepower.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation ensures proper motor sizing, electrical system design, and energy efficiency in industrial applications.

4. Using the Calculator

Tips: Enter voltage (V), current (I), motor efficiency (default 0.85), and power factor (default 0.9). Efficiency and power factor must be between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What is motor efficiency?
A: Efficiency (η) represents how well the motor converts electrical energy to mechanical energy, typically 70-95% (0.7-0.95) for AC motors.

Q2: What is power factor?
A: Power factor (PF) is the ratio of real power to apparent power, typically 0.8-0.95 for AC motors, representing phase difference between voltage and current.

Q3: Why divide by 746?
A: 746 watts equals 1 horsepower, so this converts electrical watts to mechanical horsepower.

Q4: Does this work for DC motors?
A: For DC motors, use HP = (V × I × η)/746 (no power factor needed).

Q5: Where can I find motor efficiency and power factor?
A: Check motor nameplate or manufacturer specifications. Typical values are used if unknown.