1. What is the Power Consumption Formula?

The power consumption formula calculates the electrical power input required for a three-phase motor based on its horsepower rating and efficiency. This helps in determining the actual power drawn from the electrical supply.

2. How Does the Calculator Work?

The calculator uses the power consumption formula:

Where:

• \( P \) — Power consumption in watts
• \( HP \) — Horsepower rating of the motor
• \( Eff \) — Efficiency of the motor (dimensionless, 0-1)
• 746 — Conversion factor from horsepower to watts

Explanation: The formula converts mechanical horsepower to electrical watts and accounts for motor efficiency losses.

3. Importance of Power Calculation

Details: Accurate power consumption calculation is essential for proper electrical system design, circuit sizing, energy cost estimation, and ensuring compatibility with power supply systems.

4. Using the Calculator

Tips: Enter the motor's horsepower rating and efficiency (as a decimal between 0 and 1). Both values must be positive numbers, with efficiency not exceeding 1.

5. Frequently Asked Questions (FAQ)

Q1: Why is 746 used in the formula?
A: 746 is the conversion factor from mechanical horsepower to electrical watts (1 HP = 746 watts).

Q2: What is a typical efficiency value for motors?
A: Motor efficiency typically ranges from 0.75 to 0.95 (75-95%), with higher efficiency in newer, premium motors.

Q3: Does this formula work for single-phase motors?
A: While the basic principle is similar, single-phase motors may have different efficiency characteristics and power factors that should be considered.

Q4: Why is efficiency important in power calculation?
A: Efficiency accounts for energy losses in the motor, giving a more accurate estimate of the actual electrical power required from the supply.

Q5: Can this calculator be used for energy cost estimation?
A: Yes, the calculated power consumption can be multiplied by operating hours and electricity rate to estimate energy costs.