- #1
Brittany King
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Homework Statement
For a circuit with 3 resistors in series (R1=1.00 kOhms, R2=2.50 kOhms, R3= 4.00 kOhms and Va=12.0 V). A voltmeter was placed across R2 and R3. Calculate the relative error in the voltage reading if the internal resistance of the voltmeter was a) 5000 ohms, b) 50 kOhms, C) 500 kOhms.
Homework Equations
Er = - (Rs / Rs+Rm) * 100%
The Attempt at a Solution
Rs= R3+ R4 = 4000 ohms + 2500 ohms = 65000 ohms
Er= - (6500 ohms/( 6500 ohms + 5000 ohms) * 100% = -56.5 %
The answer is a_) 15% b) -1.7% c) -0.7%
I'm guessing how I'm calculating Rs wrong but I'm not sure what else to do. Any help would be appreciated. Thanks!