WEBVTT

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Ammeter in green downstream, voltmeter in red upstream. 320 mV / 2 A = 160 mOhm

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Yet R makes 0.1 Ohm! But be careful, we measure U in R in series with the ammeter ...

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This time it is necessary to worry about the resistance of the ammeter because it is close to that to be measured! They are weak every 2!

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I moved the voltmeter and installed it downstream this time: after the ammeter and therefore directly in parallel on the resistor

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Closest result: 240 mV / 2 A = 120 milli-Ohm. Only 20% error

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Why ? I am not parallel on the resistance to measure but wires are in series!

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I connect directly as close as possible with crocodile clips to get rid of the resistors in series

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200 mV / 2 A = 100 mOhm! Low resistance: measuring downstream voltmeter: as close as possible!