Chapter 19
1. (p.581 prob.15) Consider the network of resistors shown in Fig. 19-34. Answer qualitatively: (a) What happens to the voltage across each resistor when the switch S is closed? (b) what happens to the current through each when the switch is closed? (c) What happens to the power output of the battery when the switch is closed? (d) Let R = R = R = R = 100W and V = 45.0V. Determine the current through each resistor before and after closing the switch. Are your qualitative predictions confirmed?
2. (p.582 prob.21) A 1.5-V dry cell can tested by connecting it to a low-resistance ammeter. It should be able to supply at least 25A. What is the internal resistance of the cell in this case?
3. (p.582 prob.28) Determine the magnitudes and directions of the currents through R and R in Fig. 19-37.
4. (p.583 prob.42) (a) Determine the equivalent capacitance of the circuit shown in Fig. 19-42. (b) If C1 = C2 = 2C3 = 12.5mF, how much charge is stored on each capacitor when V = 45.0V?
5. (p.583 prob.52) In Fig 19-17a, the total resistance is 15kW, and the battery's emf is 24.0V. If the time constant measured to be 35ms, calculate (a) the total capacitance of the circuit and (b) the time it tales for the voltage across the resistor to reach 16.0V.