- Joined Feb 24, 2020
I am measuring AA alkaline battery voltage with ADC and sending these values to my PC to plot the graph. Where I confused is when I connect 66 ohm to battery it's voltage dropping about 20mV. I thought it may be due to internal resistance, I calculated internal resistance from 20mV drop and 66ohm it gave me 1k ohm. I don't think the internal resistance of battery is 1k. I thought it's okay to ask it in here what causing to this drop.
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