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Article #111Electric Power in US/Canada: how to compute current?
From: Bhoot Nath
Date: Wed, 02 Oct 2002 01:51
Date: Wed, 02 Oct 2002 01:51
19 lines
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1946 bytes
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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