Why can the internal resistance of the DMM can be determined without taking into account the 100 Ω resistor? Could this be done

Question

Sedaia [141]

3 years ago

9

Why can the internal resistance of the DMM can be determined without taking into account the 100 Ω resistor? Could this be done

for a resistor of any resistance value? Explain your answer.

Physics

1 answer:

tester [92] · Answer 1 · 2022-08-17T21:27:44+03:00

Answer:

Explanation:

For resistances in parallel we know that the overall resistance will be smaller in the value than any individual resistance. so, in this case we are concerned about $\frac{1}{R}$ = $\frac{1}{Rs}$ ⁺ $\frac{1}{Rp}$

where Rs is the series resistor and Rp is the parallel resistor.

so, R = 0.9M, roughly.

So, as the infernal resistance is very high as compared to the resistance conntected in parallel that is 100 Ω is not be used.