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Electric Horsepower Formula:
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Electric horsepower is a unit of power that represents the mechanical equivalent of electrical power. It converts electrical power measured in watts to mechanical horsepower, providing a standardized way to compare electrical and mechanical power systems.
The calculator uses the electric horsepower formula:
Where:
Explanation: This formula converts electrical power measured in watts to its mechanical equivalent in horsepower, using the standard conversion factor of 746 watts per horsepower.
Details: Calculating electric horsepower is essential for comparing electrical motor performance with mechanical systems, sizing motors for specific applications, and ensuring compatibility between electrical and mechanical components in industrial and automotive applications.
Tips: Enter the electrical power in watts. The value must be positive and greater than zero. The calculator will automatically compute the equivalent electric horsepower.
Q1: What is the difference between electric horsepower and mechanical horsepower?
A: Electric horsepower specifically refers to the mechanical equivalent of electrical power, while mechanical horsepower refers to direct mechanical power output. The conversion factor (746 watts/HP) standardizes the relationship.
Q2: Why is 746 watts equal to 1 horsepower?
A: This value was established by James Watt based on his experiments with draft horses and represents the amount of power needed to lift 550 pounds one foot in one second.
Q3: Can this calculator be used for AC and DC motors?
A: Yes, the formula applies to both AC and DC electrical systems as long as the input power in watts is accurately measured or calculated.
Q4: How accurate is this conversion?
A: The conversion is mathematically exact based on the defined relationship between watts and horsepower. However, real-world motor efficiency may affect actual mechanical output.
Q5: What are typical electric horsepower values for common appliances?
A: Household appliances range from fractional horsepower (0.1-0.5 HP) for small tools to several horsepower for large air conditioners and industrial equipment.