Given a real voltmeter with an internal resistance of Rm, determine its effect w

Question

Given a real voltmeter with an internal resistance of Rm, determine its effect when measuring the voltage across R2 in the following figure. Hints: Carefully define the problem Present everything you know about the problem Establish a set of ALTERNATIVE solutions and determine the one that promises the greatest likelihood success Attempt a problem solution EVALUATE the solution and check for accuracy Has the problem been solved SATISFACTORILIY? If so, present the solution, If not, the return "ALTERNATIVE solutions" and continue through the process again.

Explanation / Answer

if voltmeter had been ideal,then voltage measured=V*R2/(R1+R2) as voltmeter has a resistance of Rm, R2 and Rm are now in parallel. net resistance(equivalent)=R2*Rm/(R2+Rm) so voltage across R2 is [V/(R1+(R2*Rm/(R2+Rm)))]*[Rm/(R2+Rm)]

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