How is horse­power mea­sured?

Science Illustrated - - ASK US -

The power of a car en­gine is mea­sured by means of metal rolls when the car’s driv­ing wheels are placed on the metal rolls. When the wheels ro­tate, the rolls ro­tate at the same speed. The ro­ta­tion is recorded by an in­stru­ment known as a dy­namome­ter, which reg­is­ters the wheels’ torque and ro­ta­tions per minute.

The data is used by a com­puter to cal­cu­late the HP of the en­gine based on a for­mula. 1 HP is the equiv­a­lent of about 736 watts – the phys­i­cal force needed to lift a mass of 75 kg 1 m ver­ti­cally above the ground in one sec­ond. In spite of the name, 1 HP is not the equiv­a­lent of the power of one horse. The an­i­mal can pro­duce 2.5-10 HP.

Two ro­tat­ing metal rolls mea­sure the HP of a car en­gine.

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