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RE: A Discharged Cap is a Short Circuit to DC

Posted by Lew (A) on November 18, 2015 at 06:58:43

In Reply to: A Discharged Cap is a Short Circuit to DC posted by Maxamillion on November 17, 2015 at 17:53:36:

Technically, you're correct. My language was sloppy. When I wrote that the battery does not "care" about its internal impedance, I only meant that the external impedance, which is by far the larger term in calculating total circuit impedance, is much more important. Further, for a fresh battery, its internal impedance is a constant low value, regardless of what is strung between its external terminals. Note that the X-axis in your graph shows full charge in around 80 milli-seconds. So, in terms of amp.hours, the shock to the battery is not so great. I wonder whether the resistor would in some way alter the "performance" of the BGT, which I don't understand in the first place. Also, the spike you show would occur only once in the lifetime of a BGT, at start-up. Could you even charge the capacitor a priori (using, say, a larger battery dedicated to that purpose), so as to avoid the issue entirely?

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