Problem 26.77-Copy Significant Figures Feedback: Your answer 64.85 V was either

Question

Problem 26.77-Copy Significant Figures Feedback: Your answer 64.85 V was either rounded differently or used a different number of significant figures than required for this part. A 228- resistor and a 588- resistor are connected in series across a 90.0-V line. Part C A voltmeter connected across the 228- resistor reads 23.8 V . Find the voltmeter resistance. Submit My Answers Give Up Part D Find the reading of the same voltmeter if it is connected across the 588- resistor Submit My Answers Give Up Part E The readings on this voltmeter are lower than the "true" voltages (that is, without the voltmeter present). Would it be possible to design a voltmeter that gave readings higher than the "true" vcllages? yes Submit My Answers Give Up

Explanation / Answer

Part C

v2 = 90 - 23.8 = 66.2
I circut = 66.2 / 588 = 0.113
R eq for R1 || R meter = 23.8 / 0.113 = 210.6
Rm = 1 /(1/Req - 1/R1) = 1 / (1/210.6 - 1/228) = 2759.6 ohm

Part D

Req when connected to 588
Req = RmR2 / (Rm+R2) = 2759.6x 588/ (2759.6 + 588) = 484.7
Vm = 90 x 484.7 / (484.7 + 228) = 61.2

Part E

NO

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