一马力等于多少千瓦？

一马力（horsepower, hp）是目前全球常用的动力单位之一，特别在汽车、机械和工程领域广泛使用。而千瓦（kilowatt, kW）则是国际单位制中的功率单位。很多人可能对一马力等于多少千瓦感到困惑，下面我将为大家详细解答这一问题。

马力（horsepower）一词最早来自于蒸汽机时代，当时是用来描述马拉动力产生的单位。它由英国工程师詹姆斯·瓦特（James Watt）于18世纪末引入，并被广泛接受。瓦特通过研究发现，一匹马能够使一台用于提水的马达在特定时间内提起550磅（约250公斤）的负荷。因此，他定义了一马力等于每秒钟执行550磅负荷的功率。

千瓦（kilowatt）是国际单位制中的功率单位，较为常见。千瓦是指每秒钟执行1000焦耳的功率。根据国际单位制，1焦耳等于1牛顿乘以1米，也就是说千瓦可以表示为每秒执行1000牛顿乘以1米的功率。

现在来回答我们一开始的问题：一马力等于多少千瓦？根据国际制定的比率，可以得出以下计算公式：

1马力 = 0.7457千瓦

这个比率是基于国际标准确定的。换句话说，当我们将马力转换为千瓦时，只需将马力数值乘以0.7457即可。

对照英文翻译：

How much is one horsepower in kilowatts?

One horsepower (hp) is one of the commonly used power units worldwide, especially in automotive, mechanical, and engineering fields. On the other hand, kilowatt (kW) is the power unit used in the International System of Units (SI). Many people may be confused about how much one horsepower is in kilowatts. In this article, I will provide a detailed explanation.

The term "horsepower" originated from the steam engine era and was initially used to describe the power produced by horses. It was introduced by British engineer James Watt in the late 18th century and widely accepted. Through his studies, Watt found that one horse could raise a load of 550 pounds (approximately 250 kilograms) over a specific period of time. Therefore, he defined one horsepower as the power required to lift a load of 550 pounds per second.

Kilowatt is the power unit used in the International System of Units (SI) and is more commonly encountered. Kilowatt is defined as the power required to perform 1000 joules of work per second. According to the International System of Units, 1 joule is equal to 1 newton multiplied by 1 meter. In other words, kilowatt can be expressed as the power required to perform 1000 newtons multiplied by 1 meter per second.

Now let's answer the question we started with: How much is one horsepower in kilowatts? According to the internationally agreed ratio, the following calculation formula can be derived:

1 horsepower = 0.7457 kilowatts

This ratio is based on international standards. In other words, when we convert horsepower to kilowatts, we simply need to multiply the horsepower value by 0.7457.