Re: [CAD_CAM_EDM_DRO] Re: relay help req. (horsepower definitions)

ballendo@... wrote:

> Doug wrote:
> >Hello Terry;
> >Horspower ratings for consumer appliances are grossly inflated. This
> >is an accepted (albeit dishonest) practice.
>
> Doug,Terry,list,
>
> Horsepower is a measure of power, or work-ability (the ability to do
> work in a time frame; in this case the work is related to what a
> horse can do). James Watt (needing a way to relate steam engine
> output to the common man) defined horsepower as the ability to raise
> 550 pounds a distance of one foot in one second. Or 33000 pounds one
> foot in one minute. Now, even a Draft Horse is going to find it tough
> going raising 33000 pounds, period! BUT, the same horse could easily
> lift 550 pounds 60 feet in one minute.
>
> The horsepower claimed for rotational tools like routers and vacuums
> is not dishonest, merely the same sort of "equation twisting" shown
> above. The dishonesty, if any, is leaving out the word "developed"
> (as in 3-1/4 DEVELOPED horsepower)

Not so! The reason is that the real horse power definition is based on a
horse being able to produce this power output for a full 8 hour day without
any over-taxing of the horse, such that he can come out and do it again
the next day. These inflated horsepower ratings are based on the current
draw during motor starting, and would cause the motor to burn out witnin one
minute if the condition persisted. Also, if you figure out how much power
you can get out of a 120 V 15A power outlet, you will have trouble delivering
even 2 full horsepower continuously from a practical motor with that available
line power. How a vacuum can carry a 6 Hp rating when it runs at about 10
Amps on 120V is obviously a lie. If the power input is clearly less than 2
electrical HP, you can't get 6 HP out of it.

Jon