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) 0.59994 A 73) 0.20 mA