Typo in Battery Test Article in Soaring
Well heck. A typo crept into my "Battery Test" article in the
February issue Soaring. So for those checking my math in footnote #1,
this is how it should have read;
"1A is the nominal current draw at 12Vdc (12W). When the
battery voltage drops below 12Vdc, the current draw is lower. Above
12Vdc, the current draw is higher. For example, at 11Vdc a 12ohm load
draws 0.92A (10.1W) and at 13Vdc a 12ohm load draws 1.1A (14.1W)."
And if someone rechecks this math they will find that P = E x I = 13 x
1.1 = 14.3W. So how did I come up with 14.1W? Because I = E/R =
13/12 = 1.08333 which I rounded to 1.1 which would give 14.3W. But
actually P = 13 x 1.08333 = 14.1W. Watch those significant digits!
Sigh.
- John DeRosa
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