[Amps] rms Volts, Amps and Watts

[peter chadwick]

I seem to remember that motors for things like electric locomotives have a 5 minute rating and a 1 hour rating, and the 5 minute rating is quite a lot higher. That gives more power to get the train rolling and faster short term acceleration.
73
Peter G3RZP





========================================
Message Received: Mar 10 2013, 06:31 AM
From: "Bill Turner" 
To: "Amps" 
Cc: 
Subject: Re: [Amps] rms Volts, Amps and Watts

ORIGINAL MESSAGE: 
On Sat, 9 Mar 2013 22:10:33 -0800, Jim wrote:

>
>## How the hell can u possibly run a 5 peak hp motor on a 120 v outlet... u can’t.

REPLY: 
Yes you can. You're forgetting about inertia. For a fraction of a second,
the mass of the rotating parts can indeed deliver lots of horsepower. Is
it sustainable? No, that's why it's peak. 

Is that useful? No, but it is true. And that's why they get away with it. 

73, Bill W6WRT
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