•29 In Fig. 27-40, R = 6.00 n, R2 = 18.0 0, and the ideal battery has emf & = 12.0 V. What are the (a) size and (b) direction (left or right) of current i? (c) How much energy is dissipated by all four resis- tors in 1.00 min? R1 %3! R. ww R2 R, ww
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- (a) Find the current in each resistor of Figure P18.18 by using the rules for resistors in series and parallel. (b) Write three independent equations for the three currents using Kirchhoffs laws: one with the node rule; a second using the loop rule through the battery, the 6.0- resistor, and the 24.0- resistor; and the third using the loop rule through the 12.0- and 24.0- resistors. Solve to check the answers found in part (a). Figure Pl8.181. Apply the Maxwell's Mesh Equation to determine i. 10Ω ww- 6 V ΙΩ 42 iz 8 V ww ww wwConsider two 24V batteries with internal resistances (a) r = 40, (b) r = 20n. • Which setting of the switch (L/R) produces the larger power dissipation in the resistor on the side? L R L, R 24V ↑ 24V 42 2Ω 4Ω 42 2 (a) (b)
- 21 C2 22 The circuit in the figure is an ec circuit with 2 resistors 2 copacitors. Initially, switch S is and open a total charge both copacitors. hos been ond of 200 MC is on stored. Switch s is clased at and copacitors resistors. are dis chorges R2 = 2 MW) it. Ia=C2= 10 NF , RI=4 MW %3D over a) Find time constant of the crcult t= ? the b) The total Chorge in the capacitor system half of the intial Chorge. how long does it drop t=?*33 O In Fig. 27-44, the current in resistance 6 is i, = 1.40 A and the resistances are R1 = R2 = R3 = 2.00 N, R, = 16.0N, R3 = 8.00 N, and R, = 4.00 2. What is the emf of the ideal battery? R R2 Rs R6 Rg Figure 27-44 Problem 33.•11 SSM In Fig. 27-29, circuit sec- tion AB absorbs energy at a rate of 50 W when current i= 1.0 A through it is in the indicated direction. Resistance R = 2.0 0. (a) What is the potential difference be- Figure 27-28 Problem 10. tween A and B? Emf device X lacks Figure 27-29 Problem 11. internal resistance. (b) What is its emf? (c) Is point B connected to the positive terminal of X or to the negative terminal?
- , ) Each resistor in the circuit shown in the drawing has the same resistance R, and the batteries have the same voltage V. The values for R and V are 9.0 ohms and 9.0 V, respectivelv. Determine the equivalent resistance and overall current R R -ww- R R ww ww VIn the figure ₁ = 4.03 V, 2 = 0.838 V, R₁ = 5.400, R₂ = 1.660, R3 = 5.390, and both batteries are ideal. What is the rate at which energy is dissipated in (a) R₁, (b) R₂, and (c) R3? What is the power of (d) battery 1 and (e) battery 2? R₁ R₂ - •18₁ (a) Number 1.388 Units W (b) Number 0.121 Units W (c) Number i 0.308 (d) Number 2.043 (e) Number i 0.228 www R$ Units W Units W Units W <25.31 • An ideal voltmeter V is con- Figure E25.31 nected to a 2.0-N resistor and a battery 0.5 N 5.0 V with emf 5.0 V and internal resistance 0.5 N as shown in Fig. E25.31. (a) What is the current in the 2.0-2 resistor? (b) What is the terminal voltage of the battery? (c) What is the reading on the voltmeter? Explain your answers. 2.0 N
- 6 Res-monster maze. In Fig. 27-21, all the resistors have a resis- tance of 4.0 0 and all the (ideal) batteries have an emf of 4.0 V. What is the current through resistor R? (If you can find the proper loop through this maze, you can answer the question with a few seconds of mental calculation.) ww ww w- ww10MF 4) Find how much time elapses before the charge on each capacitor reach 1/3 of the maximum value once the switch is closed, if R = 100 kohms. 3V R 10pF:) ii) riguos iv) 120V Electric Circuits iii) 4V + 7. For each of the following circuits, calculate a) equivelant resistance b) Current output of ballery. 12V J 1. $.31-9 242 mi Im آر3 + 652 10:00 103 10052 § 242 6.2 м bes 2002 ܝܐ1 ww m The Physics Classroom, 2020 a) heq = ORS. VA J 4₂2² b) I = 622 b) I = 4202 008 V-7 81 VA 41. 100 opre a) hea= Name: 242 felinatoq covip er not tou amro Dostpone a) Req= b) I= a) Req= b) I = Czy 8000: Work: 000/-9 BO work. 10001 A (o work. Worki Page 13