1. AP Physics Chapter 18 Answers
7) a) 60  b) 5.5 
10) 1.3  for parallel; 12  for series; 2.7  for series-parallel
6.0  for parallel-series
11) a) 30  b) 0.30 A c) 1.4 W’
21) 2.7 
25) 2.5 V; 0.25 A (2 points)
27) a) I1 = 1.0 A, I2 = I3 = 0.50 A (2 points)
b) V1 = 20 V, V2 = V3 = 10 V (2 points) c) 30 W
32) a) I1 = 1.0 A b) I2 = I3 = 0.60 A c) I4 = 0.60 A
44) a) I1 = 0.25 A b) I2 = 1.25 A c) I3 = 1.5 A
45) a) I1 = 1.5 A down b) I2 = 0.50 A right c) I3 = 0.50 A down
72) A
73) 0.20 mA