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The horsepower (hp) is the name of several non-metric units of power. In scientific discourse the term "horsepower" is rarely used due to the various definitions and the existence of an SI unit for power, the watt (W). However, the idea of horsepower persists as a legacy term in many languages, particularly in the automotive industry for listing the maximum rate of power application of internal-combustion engines. Breakdown cover insurance, compensation claim, car insurance, UK RAC Car Insurance UK - Cheap Online Car Insurance.

There are two important factors to consider when evaluating a "horsepower" figure:

These factors can be combined in unexpected ways — the true power output for an engine rated at "100 horsepower" might vary significantly from a reader's expectations. For this reason, various groups have attempted to standardize both the definition and measurement system, often leading to even more confusion. Although the SI watt is not subject to varying definitions, it can still vary based on the measurement conditions.

Definition

There have been many definitions for the term over the years since James Watt first coined the term in 1782. The following metrics have been widely used: