Question

13: A student who doesn't really know what he is doing is accustomed to making measurements with very good (nearly IDEAL) meters. However, the student is currently using meters that

are not so good. He uses the two meters to measure the resistance of R by taking R1 = Y where AV is the voltmeter reading and I is the ammeter reading. When you do not know the resistances of the meters, this is a really bad idea but the student does not realize this. The student is not sure whether to connect the voltmeter to the left or right of the ammeter (dashed lines in the figure). a: If the connection is made to the right of the ammeter, will the resulting resistance measurement be too high or too low? Explain. b: If the connection is made to the left of the ammeter, will the resulting resistance measurement be too high or too low? Explain. c: Determine the measurement which would result from the two different connections. Usee = 50 V, Rinternal = 25 N, Rvoltmeter = 4200 N, Rammeter = 15N and R1= 600 N.

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