Why there are two KW ratings of Three phase induction motor?

[kwired]

The archaic term of horsepower was coined in Scotland, by the man who became the namesake of the Watt.

As a way of comparing the output of steam engines to how many working horses they would be replacing to do the same work.

But those horses needed frequent breaks where the steam engine just needed fuel/water replenished (can do while working) and only occasional maintenance shutdowns in comparison to how often the horses needed a break.

 

[Carultch]

As a way of comparing the output of steam engines to how many working horses they would be replacing to do the same work.

But those horses needed frequent breaks where the steam engine just needed fuel/water replenished (can do while working) and only occasional maintenance shutdowns in comparison to how often the horses needed a break.

He needed to put it in terms his customers could understand. Very few people at the time would understand how to interpret the performance of the steam engine, if he put it in terms of foot-pounds-force/second, or the kilogram-meter^2/second^3. Not until James Prescott Joule would find a way to put it all together in the next century, drawing a connection among the BTU/hour, the horsepower, and the Volt-Ampere.