Answered: 3.00 N 1.00 2 9.00 V Ryar Figure P18.19…

An Introduction to Physical Science

14th Edition

ISBN:9781305079137

Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres

Chapter1: Measurement

Section: Chapter Questions

Problem 9MC

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Question

Figure P18.19 shows a
Wheatstone bridge, a
circuit used to precisely
measure an unknown
resistance R by varying
R_var until the ammeter
reads zero current
and the bridge is said
to be “balanced.” If the
bridge is balanced with R_var = 9.00 Ω, find (a) the value of
the unknown resistance R and (b) the current in the 1.00 Ω
resistor. (Hint: With the bridge balanced, the wire through the
ammeter can effectively be removed from the circuit, leaving
two pairs of resistors in parallel.)

3.00 N
1.00 2
9.00 V
Ryar
Figure P18.19
R.

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