**C2 Circuits
(Chapter 18) Homework**

**50 points**

**18.1 Resistance in parallel, series and series parallel
circuits.**

**1-8, 11, 13, 17-22, 25, 26, 29, 33, 34, 36**

** **

8: draw it! Find R parallel for the entire circuit

19: find R_{parallel}
for 8W
and for the 4W. Then, find R_{series} for R_{p8}
and R_{p4}. Remember, since the
resistor are in parallel with each other, you must divide the ultimate current
through each resistor by two since the resistors (in parallel) have the same
resistance.

25: Find R_{series}. Then, determine I_{series}. Then, determine V_{R3} based on I_{series}
and 10 volts. Then, determine V_{R1+R2}
since V_{R1+R2} + V_{R3} must equal 10 volts. Finally, determine I_{R1} based on V_{R1+R2}
and R_{1}

29: Find P_{total}
by summing the watts. Recall that I =
P/V and V is fixed at 120V.

33: First, know that
P = V^{2}/R. Find each
individual resistance for e each bulb.
Then, find equivalent resistance of the entire circuit. Realize that 15W and 40 W are in series with
each other. 60W and 100 W are in
parallel with each other but are in series with 15/40W. Realize I will be the same for each resistor
since that are all in a series circuit so you must find I_{series}.

36: Break it down and decide which is in series and which is in parallel with each other.

**18.2 Kirchhoff’s Rules**

**39, 40, 41**

41: you are going from low to high potential.

**18.3 RC Circuits**

**52--61**

Answers:

2: a

4: no; only if all resistances are equal

6: 1W; it gets the most current for the same voltage

8: 10W

18: a) 11A
b) 2W = 6A, 4W = 3A, 6W = 2A c) 2W = 72W, 4W = 36W, 6W = 24W d) P_{total} = 132W

20: 0.80W

22: 7.5W

26: a) 0.42A; 0.83A; 1.25A b) 290W; 144W; 96W

36: 8.1W

40: c

52: a

54: d

56: a) 1.5 sec b) 99.995%

58: 0.693 t

60: a) 24V b) 0 c) 4.0A