9V battery testing; Thevenin equivalent; car headlamps.
mc wrote:
Actually, in this era of digital voltage meters, I measure Vth, not Rth.
Vth drops from well over 9.0 V for a new battery to 8.8 V for one that is
showing its age.
For the handful of batteries I've measured, I get 9.4 V when they are
brand new.
Mark
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