Our equation is: S=r(Ig)/[Im-Ig] Pease show steps for b. Consider a digital mult

Question

Our equation is: S=r(Ig)/[Im-Ig] Pease show steps for b.

Consider a digital multimeter like the desk version shown in Figure 5-9 on page 5-8. What changes inside the digital multimeter when you push the button to change from the 20 mA range to the 200 mA range? Circle one of the following. current of the thing you are measuring multiplier resistance (M) shunt resistance (s) Use algebra (not your data) and the maximum currents of the ranges listed in part (a) to calculate by what factor it changes. [Show your work or state your reasoning. You may assume that I_g

Explanation / Answer

a) shunt resistance (s) changes inside the digital multimeter when we push the button to change from 20 mA range to 200mA range.

b) S=r(Ig)/[Im-Ig], this is the equation of shunt resistance. assuming Ig<< Im,

=> S=r(Ig) / Im, because (Im-Ig) is nearly equal to Im.

considering Ig=20mA and Im=200mA, S=r * 20/200 = r/10

thus the shunt resistance changes by a factor of 1/10.

c) it decreases.

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