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Horsepower (hp or HP[1]) is the name of several non-metric units of power. In scientific discourse, the term 'horsepower' is rarely used because of its various definitions and the already existent SI unit for power, the watt (W). However, use of the term 'horsepower' persists as a legacy in many languages and industries, particularly as a unit of measurement of the maximum power output of internal-combustion engines of automobiles; and often of trucks, buses, and ships. The use of 'HP' is being slowly replaced by kW (kilowatt) and MW (megawatt).

PS

This unit (German: Pferdestärke = horse strength) is no longer a statutory unit, but is still commonly used in Europe, South America and Japan, especially by the automotive and motorcycle industry. It was adopted throughout continental Europe with designations equivalent to the English 'horsepower', but mathematically different from the British unit. It is defined by the Physikalisch-Technische Bundesanstalt (PTB)[5] in Braunschweig as exactly:

1 PS = 75 kilopond·metre/second ~= 735.5 newton·m/s ~= 735.5 W ~= 0.7355 kW ~= 0.98632 hp (SAE)

The PS was adopted by the Deutsches Institut für Normung (DIN) and then by the automotive industry throughout most of Europe, under varying names. In 1992, the PS was rendered obsolete by EEC directives, when it was replaced by the kilowatt as the official power measuring unit. It is still in use for commercial and advertising purposes, as many customers are not familiar with the use of kilowatts for engines.

CV and cv

In Italian ('Cavalli'), Spanish ('Caballos'), and Portuguese ('Cavalos'), 'CV' is the equivalent to the German 'PS'. It is also used as the French term for the Pferdestärke, but in French, this should be written in lowercase letters as 'cv'.

In addition, the capital form 'CV' is a French unit for tax horsepower, short for chevaux vapeur ('steam horses') or cheval-vapeur. CV is a non-linear rating of a motor vehicle for tax purposes.[6] The CV rating, or fiscal power, is \left(\tfrac{P}{40}\right)^{1.6} + \tfrac{U}{45}, where P is the maximum power in kilowatts and U is the amount of CO2 emitted in grams per kilometre. The fiscal power has found its way into naming of automobile models, such as the popular Citroën deux-chevaux. The cheval-vapeur (ch) unit should not be confused with the French cheval fiscal (CV).

Ο χρήστης Montecarlo έγραψε:

Γι' αυτό τα γερμανικά προτιμούν τα PS.. επειδή φαίνονται περισσότερα

Oι Γερμανοί μετράνε σε Kw και είναι η ποιό στάνταρ και ακριβής μέτρηση είτε αφορά ΜΕΚ είτε ηλεκτρομότορ είτε οτιδήποτε άλλο.

Το να διαμορφώνει πάντως ο καθένας την άποψή του και να βγάζει συμπεράσματα επιστημονικής ακρίβειας με βάση τη ιδιοσυγκρασία του έχει πολύ πλάκα.......