Basic DC Theory
DC CIRCUIT ANALYSIS
Fifth, apply Ohm’s Law to obtain the voltage drops across Resistors R1, R2, and R3:
V1 = I1R1 = (0.2686 amps)(50W) = 13.43 Volts
V2 = I2R2 = (0.3458 amps)(100W) = 34.58 Volts
V3 = (I2 - I1) R3 = (0.0772 amps)(200W) = 15.44 Volts
Sixth, check the calculations by applying Kirchhoff’s Laws:
Check 1:
Apply Kirchhoff’s voltage law to the larger outer loop (Figure 41).
The sum of the voltage drops around the loop is essentially zero. (Not exactly zero due to
Figure 41 Applying Voltage Laws to Outer Loop
rounding off.)
8
13.43
34.58
40
0
0.01 @ 0
Therefore, the solution checks.
Check 2:
Use Kirchhoff’s current law at one of the junctions (Figure 42).
Rev. 0
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