Horsepower to Kilojoule per Hour Converter

Horsepower (hp) is a unit of power originally defined as the power needed to lift 550 pounds one foot in one second, approximately equal to 746 watts. It was created to compare the output of steam engines with the power of draft horses.

Horsepower was defined by James Watt around 1782 to market his steam engines by comparing their output to the familiar power of horses. It became the standard unit for mechanical power in English-speaking countries and remains widely used despite the adoption of SI units.

Horsepower is extensively used in automotive engines, mechanical equipment, and motor specifications. It's standard for car engine ratings, industrial machinery, pumps, and mechanical power transmission systems, particularly in the United States.

Kilojoule per hour (kJ/h) is a unit of power representing the rate of energy transfer of one kilojoule per hour. It provides a convenient scale for moderate power measurements in energy system analysis and thermal applications.

Kilojoule per hour developed as a practical unit for energy system analysis and thermal calculations. It provided an appropriate scale for describing power in terms of energy per time, particularly useful in heating and cooling system analysis.

Kilojoule per hour is used in energy system analysis, thermal calculations, and heating/cooling applications. It's found in energy efficiency calculations, thermal system design, and applications where energy rates are more intuitive than electrical power units.