V S (+ R₂ w + R₁ ≤ V₁ - Rvm Figure 1 – Circuit showing the use of a voltmeter
In Figure 1, the voltage divider circuit (including Rs, R1 and Rvm) can be used
to show how the performance of a VM degrades the measurement of v1 when the value of the
parallel combination of R1 and Rs (i.e., R1||Rs) increases and approaches Rvm.
a) With Vs = 5V and Rs = 100kΩ in Figure 1, find The expected (or ideal) value of v1, i.e., the voltage across R1 when Rvm is not connected (meaning the VM is OC). You need to derive the formula for v1.
b) The expected value of v1L, i.e., the voltage across R1 when Rvm is connected in parallel with (across) R1. You need to derive the formula for v1L.
Values : R1 (Ohms) = 27k, 33k, 56k, 100k, 180k
R2 (Ohms) = 51, 100, 120, 160, 220
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