Re: Electric Power in US/Canada: how to compute current?

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Article #102

#102

From: Kris Rallapalli
Date: Tue, 08 Oct 2002 00:43

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Just plugin your sandwich maker and enjoy the sandwich that comes out when you
cook it.

Don't worry about all the electrical details.





Bhoot Nath wrote:

> This is pretty simple question, but at the moment, I can not find a Google
> reference. I know that the residential power supply in North America is
> 120 volts.
>
> Q1. Is that 120 volts PEAK of the sine wave, or is that RMS voltage?
>
> Q2. If I have a sandwich maker listed as "120V, 60Hz, 900W", how much
>     maximum current does it draw? Assuming a 100% resistive load,
>     is it  900 / (120 * alpha)
>
>     where alpha = [ integral of (Sin x)^2, from 0 to pi ] / pi = 0.50
>
> In other words, will the sandwich maker draw 15 amperes of current? If
> that is not correct, how do I compute it?
>
> Q3. How do I go about computing current drawn by other appliances which
> may not be completely resistive?
>
> No, this is NOT a homework problem!

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From: Kris Rallapalli <sysop@kepnet.com>
Newsgroups: sbay.general,ba.general,ba.consumers,misc.consumers
Subject: Re: Electric Power in US/Canada: how to compute current?
Date: Mon, 07 Oct 2002 17:43:31 -0700
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