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

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Article #112

#112

From: L Alpert
Date: Wed, 02 Oct 2002 02:12

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"Bhoot Nath" <deja_bhoot2000@yahoo.com> wrote in message
news:309e7c98.0210011751.51a56500@posting.google.com...
> 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?

117 RMS

>
> 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)
>

About 7.7 amps

>     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?
>

Coarse, watts/volts

> Q3. How do I go about computing current drawn by other appliances which
> may not be completely resistive?

I'd have to refer to some old text.  It's been awhile.

>
> No, this is NOT a homework problem!

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From: "L Alpert" <alpertl@xx_attbi.com>
Newsgroups: sbay.general,ba.general,ba.consumers,misc.consumers,sci.electronics
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Subject: Re: Electric Power in US/Canada: how to compute current?
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