Concept explainers
A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. (i) What then happens to the brightness of lamp B? (a) It increases. (b) It decreases somewhat. (c) It does not change. (d) It drops to zero. For parts (ii) to (vi), choose from the same possibilities (a) through (d). (ii) What happens to the brightness of lamp C? (iii) What happens to the current in the battery? (iv) What happens to the potential difference across lamp A? (v) What happens to the potential difference across lamp C? (vi) What happens to the total power delivered to the lamps by the battery?
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Chapter 28 Solutions
Physics for Scientists and Engineers, Technology Update, Hybrid Edition (with Enhanced WebAssign Multi-Term LOE Printed Access Card for Physics)
- Consider a series RC circuit as in Figure P28.38 for which R = 1.00 M, C = 5.00 F, and = 30.0 V. Find (a) the time constant of the circuit and (b) the maximum charge on the capacitor after the switch is thrown closed. (c) Find the current in the resistor 10.0 s after the switch is closed.arrow_forwardYou connect a battery, resistor, and capacitor as in the figure, where R = 16.0 Ω and C = 8.00 ×10−6 F. The switch S is closed at t = 0. When the current in the circuit has magnitude 3.00 A, the charge on the capacitor is 40.0 × 10−6 C. (a) What is the emf of the battery? (b) At what time t after the switch is closed is the charge on the capacitor equal to 40.0×10−6 C? (c) When the current has magnitude 3.00 A, at what rate is energy being stored in the capacitor? (d) When the current has magnitude 3.00 A, at what rate is energy being supplied by the battery?arrow_forwardA resistor with R1 = 25.0 Ω is connected to a battery that has negligible internal resistance and electrical energy is dissipated by R1 at a rate of 36.0 W. If a second resistor with R2 = 15.0 Ω is connected in series with R1, what is the total rate at which electrical energy is dissipated by the two resistors?arrow_forward
- In the figure the ideal batteries have emfs 1 = 26 V and 2 = 7.0 V and the resistors have resistances R1 = 4.2 Ω and R2 = 8.3 Ω. What are (a) the current, the energy dissipation rate in (b) resistor 1 and (c) resistor 2, and the energy transfer rate in (d) battery 1 and (e) battery 2? Is energy being supplied or absorbed by (f) battery 1 and (g) battery 2?arrow_forwardYou connect a battery, resistor, and capacitor as in (Figure 1), where E = 46.0 V, C = 5.00 μF, and R = 130 Ω. The switch S is closed at t = 0. When the voltage across the capacitor is 8.00 VV, what is the magnitude of the current in the circuit? At what time tt after the switch is closed is the voltage across the capacitor 8.00 V? When the voltage across the capacitor is 8.00 V, at what rate is energy being stored in the capacitor?arrow_forwardQ2. To determine the galvanometer's internal resistor R. and its maximum electric current Is, corresponding to a maximum deviation of its needle, we mount it in series with a rheostat, as shown in the adjacent figure. R a b son Reosta Galvanometre When the needle makes a maximum deviation Vab = V1 = 5 V and Rr= R1 = 80 k 2. When the needle makes 1/2 maximum deviation Vab = V2 = 2 V and Rp = R2 = 60 ko. When the needle makes 44 maximum deviation Vab = V3 = 2 V and Rr = R3 . V a) Write the relationship between V1, R1, Rc and le. b) Write the relationship between V2, R2, Re and Ic. c) Write the relationship between V3, R3, Re and Ic. d) Determine the values of Re and Ic. e) Determine the value of Rs. Answer:arrow_forward
- In Figure P29.81, N real batteries, each with an emf and internal resistance r, are connected in a closed ring. A resistor R can be connected across any two points of this ring, causing there to be n real batteries in one branch and N n resistors in the other branch. Find an expression for the current through the resistor R in this case.arrow_forwardFigure P29.46 shows a circuit with a 12.0-V battery connected to four resistors. How much power is delivered to each resistor?arrow_forwardFigure P29.77 shows a circuit with two batteries and three resistors. a. How much current flows through the 2.00- resistor? b. What is the potential difference between points a and b in the circuit?arrow_forward
- What is the equivalent resistance between points a and b of the six resistors shown in Figure P29.70? FIGURE P29.70arrow_forwardFigure P29.45 shows five resistors connected between terminals a and b. a. What is the equivalent resistance of this combination of resistors? b. What is the current through each resistor if a 24.0-V battery is connected across the terminals?arrow_forwardA lightbulb is connected to a variable power supply. As the potential across the bulb is varied, the resulting current and the filaments temperature are measured. The data are listed in Table P28.38. a. Find R for each entry in Table P28.38, and then plot R as a function of T. b. Assume that room temperature is at 293 K. Find R0 (resistance at room temperature). Comment on your result.arrow_forward
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