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With the engine in place, the car wheels are placed on a a set of rollers, red lined in first or second gear, measured by a dynamometer and a measurement is taken sensing how fast the car engine can move the rollers.
Power is speed x force x constant or revs x torque x constant, where the constant depends on the units used.
A dynamometer is basically a brake with a sensor on it to measure torque. Hence power measured in this way is termed Brake Horsepower.
Generally the horsepower quoted for cars is the horsepower generated by the engine. It doesn't take account of the losses in the transmission. Therefore it will be higher than that measured according to the first paragraph above. It is measured on a testbed with the engine directly attached to the dynamometer.
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