Buggé/Sierzega: Circuits 1
Kirchhoff’s Rules
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Read Section 26-1 EMF and Terminal Voltage
Read Section 26-2 Resistors in Series and in Parallel (this should be review)
Read Section 26-3 Kirchhoff’s Rules.
o Complete Examples 26-8 through 26-11.
1.1 Represent and reason Complete the table that follows for the circuit shown in the first cell.
The circuit
Identify currents with arrows and symbols.
100 
9V
9V
100 
1.5 V
1.5 V
B
A
20 
Apply the junction rule for junctions A and B.
Junction A:
Junction B:
Determine the current through each branch.
B
A
20 
Apply the loop rule for three different loops.
Buggé/Sierzega: Circuits 1
1.2 Represent and reason Complete the table that follows for the circuit shown in the first cell.
The circuit
A
2.
>
Identify currents with arrows and symbols.
2. > 1
1
R1
R2
B
Apply the junction rule for junctions A and B.
A
R1
R2
B
Apply the loop rule for three different loops.
Junction A:
Junction B:
Determine the current through each branch.
1.3 Equation jeopardy The application of Kirchhoff’s loop rule and junction rule for two
circuits are shown in the first cell of the table. Complete the table for each circuit.
Mathematical description
Loop-rule equations:
9.0 V – (3.0 A)(1.0 ) – (2.0 A)(3 ) = 0
9.0 V – (3.0 A)(1.0 ) – (1.0 A)(6 ) = 0
Junction-rule equation:
+3.0 A – 2.0 A – 1.0 A = 0
Loop-rule equations:
9.0 V – I2 (1.0 ) – 3.0 V = 0
9.0 V – I3 (6.0 ) = 0
Junction-rule equation:
+ I1 – I2 – I3 = 0
Draw a circuit that is consistent with the
mathematical description and include
arrows with symbols identifying the
currents.
Buggé/Sierzega: Circuits 1
1.4 For the following circuits, provide a sketch of the circuit. Include an arrow and label for each
of the different currents. Right down the Kirchoff junction and loop laws that apply to the
circuit. Remember that the number of equations you write down should exactly match the
number of different currents in the circuit. DO NOT solve any of the Kirchoff laws.
a. Figure 26-33 page 679
b. Figure 26-35 page 679
c. Figure 26-41 page 680
d. Figure 26-42 page 681