A Wheatstone bridge is a type of “bridge circuit" used to make measurements of resistance. The unknown resistance to be measured, Rx, is placed in the circuit with accurately known resistances R1, R2 , and R3 (Fig. 19–76). One of these, R3, is a variable resistor which is adjusted so that when the switch is closed momentarily, the ammeter O shows zero current flow. The bridge is then said to be balanced. (a) Determine Ry in terms of R1 , R2, and R3. (b) If a Wheatstone bridge is “balanced" when R1 = 590 N, R2 = 972 N, R3 = 78.6 N, what is the value of the В R3 Rx A Ammeter and A C S unknown resistance? Ri R2 D FIGURE 19–76 Problem 74. Wheatstone bridge. ww

A Wheatstone bridge is a type of “bridge circuit" used to make measurements of resistance. The unknown resistance to be measured, Rx, is placed in the circuit with accurately known resistances R1, R2 , and R3 (Fig. 19–76). One of these, R3, is a variable resistor which is adjusted so that when the switch is closed momentarily, the ammeter O shows zero current flow. The bridge is then said to be balanced. (a) Determine Ry in terms of R1 , R2, and R3. (b) If a Wheatstone bridge is “balanced" when R1 = 590 N, R2 = 972 N, R3 = 78.6 N, what is the value of the В R3 Rx A Ammeter and A C S unknown resistance? Ri R2 D FIGURE 19–76 Problem 74. Wheatstone bridge. ww

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

A Wheatstone bridge is a type of “bridge circuit" used to
make measurements of resistance. The unknown resistance
to be measured, Rx, is placed in the circuit with accurately
known resistances R1, R2 , and R3 (Fig. 19–76). One of these,
R3, is a variable resistor which is adjusted so that when the
switch is closed momentarily, the ammeter O shows zero
current flow. The bridge is then said to be balanced.
(a) Determine Ry in terms of R1 , R2,
and R3. (b) If a Wheatstone
bridge is “balanced"
when R1 = 590 N,
R2 = 972 N,
R3 = 78.6 N, what
is the value of the
В
R3
Rx
A
Ammeter
and
A
C
S
unknown resistance?
Ri
R2
D
FIGURE 19–76
Problem 74.
Wheatstone bridge.
ww

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