Convert Horsepower To Amps Calculator

Three-Phase Power Formula:

\[ I = \frac{HP \times 746}{V \times \sqrt{3} \times PF \times Eff} \]

Horsepower (HP):

Voltage (V):

Volts

Power Factor (PF):

(0-1)

Efficiency (Eff):

(0-1)

Current (I):

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1. What is the Three-Phase Power Formula?

The three-phase power formula converts horsepower to electrical current (amps) in a three-phase AC system. It accounts for power factor and efficiency to provide accurate current calculations for motor sizing and electrical system design.

2. How Does the Calculator Work?

The calculator uses the three-phase power formula:

\[ I = \frac{HP \times 746}{V \times \sqrt{3} \times PF \times Eff} \]

Where:

\( I \) — Current in amperes (Amps)
\( HP \) — Horsepower
\( V \) — Voltage in volts
\( PF \) — Power factor (dimensionless, 0-1)
\( Eff \) — Efficiency (dimensionless, 0-1)
\( \sqrt{3} \) — Square root of 3 (approximately 1.732)
\( 746 \) — Conversion factor from HP to watts

Explanation: The formula converts mechanical power (HP) to electrical power requirements, accounting for system inefficiencies and power factor in three-phase systems.

3. Importance of Current Calculation

Details: Accurate current calculation is essential for proper wire sizing, circuit breaker selection, motor protection, and ensuring electrical system safety and efficiency.

4. Using the Calculator

Tips: Enter horsepower, voltage, power factor (typically 0.8-0.95 for motors), and efficiency (typically 0.8-0.95). All values must be positive numbers with power factor and efficiency between 0-1.

5. Frequently Asked Questions (FAQ)

Q1: Why is 746 used in the formula?
A: 746 watts equals 1 horsepower, so this conversion factor translates mechanical power to electrical power requirements.

Q2: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. Lower power factors require higher current for the same real power, affecting system efficiency.

Q3: What are typical efficiency values for motors?
A: Motor efficiency typically ranges from 80-95%, with higher efficiency in larger, newer motors and premium efficiency models.

Q4: When should this calculation be used?
A: Use for three-phase AC motor applications, electrical system design, circuit protection sizing, and generator sizing calculations.

Q5: Are there limitations to this formula?
A: This formula assumes balanced three-phase systems and may need adjustment for single-phase systems, unbalanced loads, or non-sinusoidal waveforms.