Concept explainers
Carefully examine a bulb. Two wires extend from the filament of the bulb into the base. You probably cannot see into the base, however, you should be able to make a good guess as to where the wires are attached. Describe where the wires attach. Explain based on your observations in Parts A-C.
On the basis of the observations that we have made, we will make the following assumptions:
1. A flow exists in a complete circuit from one terminal of the battery, through the rest of the circuit, back to the other terminal of the battery, through the battery and back around the circuit. We will call this flow
2. For identical bulbs, bulb brightness can be used as an indicator of the amount of current through that bulb: the brighter the bulb, the greater the current.
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- Consider the circuit shown in (Figure 1). The batteries have emfs of E = 9.0 V and E2 = 12.0 V and the resistors have values of R1 = 28 N, R2 = 68 N, and Rз 3 34 N. Part C Determine the magnitudes of the currents in each resistor shown in the figure. Assume th resistance r = 1.0 N. Express your answers using two significant figures separated by commas. Templates Symbols undo rédo reset keyboard shortcuts help ΑΣΦ Figure I1, I2, I3 = А 1 of 1 > Submit Previous Answers Request Answer R1 X Incorrect; Try Again; 3 attempts remaining Ej R2 Part D E2= R3 Determine the directions of the currents in each resistor. Assume that each battery has inarrow_forwardUse the orders of magnitude you found in the previous problem to answer the following questions to within an order of magnitude. (a) How many electrons would it take to equal the mass of a proton? (b) How many Earths would it take to equal the mass of the Sun? (c) How many Earth-Moon distances would it take to cover the distance from Earth to the Sun? (d) How many Moon atmospheres would it take to equal the mass of Earth’s atmosphere? (e) How many moons would it take to equal the mass of Earth? (f) How many protons would it take to equal the mass of the Sun? For the remaining questions, you need to use Figure 1.4 to obtain the necessary orders of magnitude of lengths, masses, and times.arrow_forwardA 24.0 V battery is wired in parallel with three resistors, R1 = 10.0 Ohms, R2 = 60.0 Ohms, and R3 = 150.0 Ohms. a.) Using either the computer drawing tools or a scanned hand written diagram, draw this circuit including proper symbols and labels. (Do not copy and paste an image from any other resource) b.) Find the equivalent resistance and total current running through the circuit. Show your work and label the current flow on your diagram. c.) Find the current flow and voltage drop through each resistor. Show your work and explain.arrow_forward
- The voltage V (volts), current I (amperes), and resistance R (ohms) of an electric circuit like the one shown here are related by the equation V=IR. Suppose that V is 1 increasing at the rate of 3 volt/sec while I is decreasing at the rate of amp/sec. Let t denote time in seconds. Answer the following questions. 5 dV dt = dl dt dl b. What is the value of dt? volt/sec (Simplify your answer.) OA. O C. amp/sec (Simplify your answer.) c. What equation relates to dR dt dR dV dt dt dR dt 1 dV dl +V- I dt dt dl dv =1+VdT dt dl and dt? OB. O D. d. Find the rate at which R is changing when V = 40 volts and 1= 4 amp. Is R increasing or decreasing? R is changing at ohm/sec. (Simplify your answer.) Is R increasing or decreasing? dR dt dR dt = 1 dv I'dt 1 (dV 1 dt V dl I dt F R wwwarrow_forwardConsider the circuit in (Figure 1). Suppose that v₁ = 14 V, v2 = 5 V, and i = 5 mA. Figure i + 1 of 1 5 mA source is absorbing power. 5 V and 14 V sources are developing power. 5 V and 14 V sources are absorbing power. 5 mA source is developing power. All sources are absorbing power. O All sources are developing power. Submit Correct Part G Previous Answers What is the total power developed in the circuit if the polarity of the 14 V source is reversed? Express your answer to three significant figures and include the appropriate units. P= 25 Submit mW Previous Answers Request Answer ? X Incorrect; Try Again; 3 attempts remainingarrow_forwardIn a given fluid, positive ions, each with 2 excess protons, move to the right at a steady rate of 1.7 × 1019 ions per minute and negative ions, each with 4 excess electrons, move to the left at a rate of 3.7 × 1019 ions per minute. Determine the current directed to the right. Use the fundamental unit of charge to be C. Determine the current (in amperes) to the right. Express your final answers to four decimal placesarrow_forward
- Part A During an action potential, Na+ jons move into the cell at a rate of about 3 x 10-7mol/m2 - s. How much power must be produced by the "active Na+ pumping" system to produce this flow against a +30-mV potential difference? Assume that the axon is 90 cm long and 30 um in diameter. Express your answer using two significant figures. P = W Submit Request Answerarrow_forwardProblem 4 In the circuit to the right, & = 1.2kV, C = 6.5 µF, and R₁ = R₂ R3 = R = 0.73 M. With C completely uncharged, switch S is sud- denly closed at t = 0. Remember to draw equivalent circuits to help with the analysis! R₁ S R₂₂ R₂ (a) At t = 0, what is the voltage across the capacitor? How are the voltages across R3 and R₂ related? (b) At t = 0, what are the currents in each resistor? (c) For t→∞o, what are the currents in each resistor? (d) For t→ ∞o, what are the voltages across each resistor? (e) For t → ∞, what is the voltage across the capacitor? (f) Once the circuit has nearly reached equilibrium, the switch is reopened. What is the current in each resistor right after the switch is reopened? The equivalent circuit will be super useful here; note that when we change the circuit by opening the switch, the capacitor is no longer in steady state - do not assume its current is zero! (g) How long after the switch is reopened does it take for the current in R3 to drop to half of…arrow_forwardIn the circuit shown in the figure (Figure 1), C=5.90μF, E=28.0V, and the emf has negligible resistance. Initially, the capacitor is uncharged and the switch Sis in position 1. The switch is then moved to position 2 so that the capacitor begins to charge. Part A What will be the charge on the capacitor a long time after the switch is moved to position 2? Part B After the switch has been in position 2 for 3.00 ms, the charge on the capacitor is measured to be 110μC. What is the value of the resistance R? Part C How long after the switch is moved to position 2 will the charge on the capacitor be equal to 99.0% of the final value found in part A?arrow_forward
- The switch in the figure has been in position a for a long time. It is changed to position b at t = 0 s. the charge Q on the capacitor immediately after the switch is changed is 18 μC the current I through the resistor immediately after the switch is changed is Part A What is the charge Q on the capacitor at t = 40 μs?Express your answer with the appropriate units. Part B What is the current I through the resistor at t = 40 μs?Express your answer with the appropriate units. Part C what is the charge Q on the capacitor at t = 200 μs?Express your answer with the appropriate units. Part D What is the current I through the resistor at t = 200 μs?Express your answer with the appropriate units.arrow_forward1. What is the time constant of the circuit formed when a and c are connected? Give your answer in ms to 3 significant digits. 2. What is the time constant of the circuit formed when b and c connected? Give your answer in ms to 3 significant digits. 3. You perform the following sequence of events. The capacitor starts uncharged and the switch is flipped to connect a and c. The capacitor is charged for 20 ms. The switch is then flipped to connect b and c, and the capacitor is discharged for 26 ms, at which time the switch is set to the position where it is not in contact with either a or b. What is the voltage on the capacitor? Give your answer to 2 significant digits.arrow_forwardPart B. Finding the PD Directions: Solve the following problems. Write your answer on a clean sheet of paper. Show your solutions. 1. To carry how much charge between two points having potential difference equal to 220 V, 1760 J of work is done? Ans. 8 C 2. The EMF of a cell falls from 3 volts to 2.8 volts when its terminals are joined to an electrical load of 4 Ohms. Calculate the internal resistance of the cell.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University