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Physics
Classical Physics
Electromagnetism
How to Measure Internal Resistance of a Battery
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[QUOTE="Nik_2213, post: 6858665, member: 252015"] Slightly tangential, I remember measuring the internal resistance of Uni lab's wall-power via current & voltage of an incremental dummy load, a bank of 60 watt incandescent lamps. And, yes, the Lab Tech did warn us [B][I]NOT [/I][/B]to 'just' use the resistance scale of the big Avo analogue multi-meters supplied: He'd expended half a CO2 extinguisher on [I]that [/I]hapless perp. Even an Avo's fusing had its limits... FWIW, when it came to wiring up two long-legged germanium transistors etc as a free-running ~1 kHz multi-vibrator, the lecturer was [B][I]appalled [/I][/B]to find I'd briskly plugged his components into my S-Dec, a palm-sized solderless breadboard. I was done before most of my fellow students had laid out their nail-bed bread-boards, never mind tinned a chunky soldering iron. I had to do mine over the traditional way. No sweat, I'd brought along several of my favourite hair-clip heat-sinks, was soon done... He was left speechless when I mentioned that three stages made a fun 'Flip-Flap-Flop', four ran as 'two-pair', five did 'two pair plus a runt pulse' and six did 'two prials'... [/QUOTE]
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How to Measure Internal Resistance of a Battery
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