HPs vs. WATTs

Posted by admin on July 29th, 2010 at 02:17pm

Please, enlighten me. On this page I read:

1/3 HP Buffing Machine

* 110 volts
* 3450 rpm
* 4.2 amps
* single phase
* 60hz

which can be translated into the POWER by multiplying VOLTS and AMPS. So, 110V X 4.2A = 462 WATTs. Since 1 HP is approx. 740W , the power of the motor is 0.62 HP, which is approx. 2/3 HP and not 1/3 HP.

Is the efficiency of the motor 50% only. I think that electrical motors have efficiency around 80-90%.

So, please, help me out. What is wrong with my calculation ?

:shock: :shock:

This is post is sent to the Surface Finishing section from a blog about Aluminium, Coating, Plate, Metals, Nickel, Chemical, Anodising, Chrome Plating, Plating or Chromic acid. Post title is HPs vs. WATTs and blog title is Plating Powder Coating Buffing Anodizing – Caswell Inc. Metal Finishing Forum. Please click. to view the orijinal source.

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