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In IFS2023 tractors are classified according to the kW (kilowatt) of their motor. A watt is a measure of energy. A watt is the measure of the rate of power flow. When one ampere (amp) flows through an electrical difference of one volt (V), this is equal to one watt (W) . There are one thousand watts in a kilowatt.
Another common unit of power for tractors is the horsepower (hp), the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. DIN 66036 defines one metric horsepower as the power to raise a mass of 75 kilograms against the Earth's gravitational force over a distance of one metre in one second: 75 kg × 9.80665 ms2 × 1 m 1 s = 75 kgf⋅ms = 1 PS. This is equivalent to 735.49875 W, or 98.6% of an imperial mechanical horsepower.
In 1972, the PS was replaced by the kilowatt as the official power-measuring unit in EEC directives.
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Table 6 – Correspondence of kW and hp
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