18.0 V 5.00 Ω 8.00 N 12.0 V 11.00 7.00 A 5.00 A 36.0 V

University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
Publisher:OpenStax
Chapter7: Electric Potential
Section: Chapter Questions
Problem 2CQ: Why do we need to be careful about work done on the system versus work done by the system in...
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For the circuit shown in Figure P27.22, we wish to find the currents I1
, I2
, and I3
. Use
Kirchhoff’s rules to obtain equations for (a) the upper loop, (b) the lower loop, and (c)
the junction on the left side. In each case, suppress units for clarity and simplify,
combining the terms. (d) Solve the junction equation for I3
. (e) Using the equation
found in part (d), eliminate I3
from the equation found in part (b). (f) Solve the
equations found in parts (a) and (e) simultaneously for the two unknowns I1 and I2
. (g)
Substitute the answers found in part (f) into the junction equation found in part (d),
solving for I3
. (h) What is the significance of the negative answer for I2?
Figure P27.22

18.0 V
5.00 Ω
8.00 N
12.0 V
11.00
7.00 A
5.00 A
36.0 V
Transcribed Image Text:18.0 V 5.00 Ω 8.00 N 12.0 V 11.00 7.00 A 5.00 A 36.0 V
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