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phymath7
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- TL;DR Summary
- Why do we have to measure low resistance (in method of fall of potential )and galvanometer resistance (method of half-deflection ) for both direct and reverse current?
What is it's benefit?
I don't have reference from any higher level practical book but from a local writter of my country.So I am not providing reference as I think that won't be considered worthy.But my teacher said that it's done to nullify the effect of resistance of the connecting wires.I am not sure how that works.BvU said:Who says we do ? Do you have a reference, some context. a link ?
That doesn't make sense to me either. It would be a good way of identifying voltages that don't depend on the current direction, like a voltage offset from a battery, or voltages that depend too much on polarity, like a diode in the circuit. It's also just a good sanity check of the instrument and the circuit being tested. The answer should usually be the same, if it's not, more investigation is needed.phymath7 said:I don't have reference from any higher level practical book but from a local writter of my country.So I am not providing reference as I think that won't be considered worthy.But my teacher said that it's done to nullify the effect of resistance of the connecting wires.I am not sure how that works.
You haven't given us adequate context to understand what's being said. What connecting wires? What do they connect? Can you show us a diagram?phymath7 said:But my teacher said that it's done to nullify the effect of resistance of the connecting wires.I am not sure how that works.