In the circuit below the voltmeter has an internal resistance of 100kohms and th

Question

In the circuit below the voltmeter has an internal resistance of 100kohms and the ammeter a negligible resistance. Show all calculations.

a. What is the ammeter reading?

b. If we use this reading to calculate the value of R, what will be the %-error found?

c. How can we reposition th voltmeter to reduce this error and why will this position work?

In the circuit below the voltmeter has an internal resistance of 100kohms and the ammeter a negligible resistance. Show all calculations. a. What is the ammeter reading? b. If we use this reading to calculate the value of R, what will be the %-error found? c. How can we reposition th voltmeter to reduce this error and why will this position work?

Explanation / Answer

ammeter reading = I = v/R = 50 / 200 000 = 2.5X10^-4 A. R= V/I ==> 50 / 2.5 X 10^-4 we can reposition the voltmeter s terminal across right end of resistor and left end of the ammeter

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