College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 21, Problem 46PE
Find the resistance that must be placed in series with a 25.0- Ω galvanometer having a 50.0-μA sensitivity (the same as the one discussed in the text) to allow it to be used as an ammeter with a 10.0-A full-scale reading. Include a circuit diagram with your solution.
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A common flashlight bulb is rated at 0.300 A and 2.70 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 2.20 Ω, what is the temperature of the filament, in degrees Celcius (degC), when the bulb is on? The filament is made of tungsten.
E. 2.2: Find the equivalent resistance across terminals A and B shown in the figure below. All resistors are in ohms. Answer: R-2.4170
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Chapter 21 Solutions
College Physics
Ch. 21 - Prob. 1CQCh. 21 - Prob. 2CQCh. 21 - Prob. 3CQCh. 21 - Prob. 4CQCh. 21 - Prob. 5CQCh. 21 - Knowing that the severity of a shock depends on...Ch. 21 - Would your headlights dim when you start your...Ch. 21 - Some strings of holiday lights are wired in series...Ch. 21 - If two household lightbulbs rated 60 W and 100 W...Ch. 21 - Suppose you are doing a physics lab that asks you...
Ch. 21 - Before World War II, some radios got power through...Ch. 21 - Some light bulbs have three power settings (not...Ch. 21 - Is every emf a potential difference? Is every...Ch. 21 - Prob. 14CQCh. 21 - Given a battery, an assortment of resistors, and a...Ch. 21 - Two different 12-V automobile batteries on a store...Ch. 21 - What are the advantages and disadvantages of...Ch. 21 - Semitractor trucks use four large 12-V batteries....Ch. 21 - Prob. 19CQCh. 21 - Prob. 20CQCh. 21 - Prob. 21CQCh. 21 - Prob. 22CQCh. 21 - Prob. 23CQCh. 21 - Prob. 24CQCh. 21 - Suppose you are using a multimeter (one designed...Ch. 21 - Prob. 26CQCh. 21 - Prob. 27CQCh. 21 - Why can a null measurement be more accurate than...Ch. 21 - If a potentiometer is used to measure cell emfs on...Ch. 21 - Regarding the units involved in the relationship t...Ch. 21 - The RC time constant in heart defibrillation is...Ch. 21 - When making an ECG measurement, it is important to...Ch. 21 - Prob. 33CQCh. 21 - Prob. 34CQCh. 21 - Prob. 35CQCh. 21 - Prob. 36CQCh. 21 - A long, inexpensive extension cord is connected...Ch. 21 - Prob. 38CQCh. 21 - Prob. 39CQCh. 21 - (a) What is the resistance often 275-O resistors...Ch. 21 - (a) What is the resistance of a 1.00 102-O, a...Ch. 21 - What are the largest and smallest resistances you...Ch. 21 - An 1800-W toaster, a 1400-W electric frying pan,...Ch. 21 - Your car’s 30.0-W headlight and 2.40-kW starter...Ch. 21 - (a) Given a48.0-V battery and 24.0-O and 96.0-O...Ch. 21 - Referring to the example combining series and...Ch. 21 - Referring to Figure 21.6: (a) Calculate P3 and...Ch. 21 - Refer to Figure 21.7 and the discussion of lights...Ch. 21 - Prob. 10PECh. 21 - Show that if two resistors R1and R2are combined...Ch. 21 - Unreasonable Results Two resistors, one having a...Ch. 21 - Unreasonable Results Two resistors, one having a...Ch. 21 - Standard automobile batteries have six lead-acid...Ch. 21 - Car bon-zinc dry cells (sometimes referred to as...Ch. 21 - What is the output voltage of a 3.0000-V lithium...Ch. 21 - (a) What is the terminal voltage of a large 1.54-V...Ch. 21 - What is the internal resistance of an automobile...Ch. 21 - (a) Find the terminal voltage of a 12.0-V...Ch. 21 - A car battery with a 12-V emf and an internal...Ch. 21 - The hot resistance of a flashlight bulb is 2.30 ,...Ch. 21 - The label or a portable radio recommends the use...Ch. 21 - An automobile starter motor has an equivalent...Ch. 21 - A child’s electronic toy is supplied by three...Ch. 21 - (a) What is the internal resistance of a voltage...Ch. 21 - A person with body resistance between his hands of...Ch. 21 - Electric fish generate current with biological...Ch. 21 - Integrated Concepts A 12.0-V emf automobile...Ch. 21 - Unreasonable Results A 1.58-V alkaline cell with a...Ch. 21 - Unreasonable Results (a) What is the internal...Ch. 21 - Prob. 31PECh. 21 - Prob. 32PECh. 21 - Verify the second equation in Example 21.5 by...Ch. 21 - Verify the third equation in Example 21.5 by...Ch. 21 - Prob. 35PECh. 21 - Prob. 36PECh. 21 - Prob. 37PECh. 21 - Prob. 38PECh. 21 - Solve Example 21.5, but use loop abcdefgha instead...Ch. 21 - Prob. 40PECh. 21 - Prob. 41PECh. 21 - What is the sensitivity of the galvanometer (that...Ch. 21 - What is the sensitivity of the galvanometer (that...Ch. 21 - Find the resistance that must be placed in series...Ch. 21 - Find the resistance that must be placed in series...Ch. 21 - Find the resistance that must be placed in series...Ch. 21 - Find the resistance that must be placed in...Ch. 21 - Find the resistance that must be placed in series...Ch. 21 - Find the resistance that must be placed in...Ch. 21 - Prob. 50PECh. 21 - Suppose you measure the terminal voltage of a...Ch. 21 - A certain ammeter has a resistance of 5.00X10-5 ...Ch. 21 - A 1,00-?O voltmeter is placed in parallel with a...Ch. 21 - A 0.0200- ammeter is placed in series with a...Ch. 21 - Unreasonable Results Suppose you have a 40.0-...Ch. 21 - Unreasonable Results (a) What resistance would you...Ch. 21 - What is the emf x of a cell being measured in a...Ch. 21 - Calculate the emfx of a dry cell for which a...Ch. 21 - When an unknown resistance Rxis placed in a...Ch. 21 - To what value must you adjust R3to balance a...Ch. 21 - (a) What is the unknown emfx in a potentiometer...Ch. 21 - Suppose you want to measure resistances in the...Ch. 21 - The timing device in an automobile’s intermittent...Ch. 21 - A heart pacemaker fires 72 times a minute, each...Ch. 21 - The duration of a photographic flash is related to...Ch. 21 - A 2.00- and a 7.50-F capacitor can be connected in...Ch. 21 - After two time constants, what percentage of the...Ch. 21 - A 500- resistor, an uncharged 1.50-F capacitor and...Ch. 21 - A heart defibrillator being used on a patient has...Ch. 21 - An ECG monitor must have an RC time constant less...Ch. 21 - Prob. 71PECh. 21 - Using the exact exponential treatment, find how...Ch. 21 - Using the exact exponential treatment, find how...Ch. 21 - Integrated Concepts If you wish to take a picture...Ch. 21 - Integrated Concepts A flashing lamp in a Christmas...Ch. 21 - Integrated Concepts A 160F capacitor charged to...Ch. 21 - Unreasonable Results (a) Calculate the capacitance...Ch. 21 - Construct Your Own Problem Consider a camera's...Ch. 21 - Construe! Your Own Problem Consider a rechargeable...Ch. 21 - Prob. 1TPCh. 21 - Prob. 2TPCh. 21 - Prob. 3TPCh. 21 - Prob. 4TPCh. 21 - Prob. 5TPCh. 21 - Prob. 6TPCh. 21 - Prob. 7TPCh. 21 - Prob. 8TP
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- Find the resistance that must be placed in series with a 25.0-Ω galvanometer having a 50.0-μA sensitivity (the same as the one discussed in the text) to allow it to be used as a voltmeter with a 3000-V full-scale reading. Include acircuit diagram with your solution.arrow_forwardConsider the circuit shown in the figure below. (Let R1 = 5.00 Ω, R2 = 7.00 Ω, and E = 10.0 V.). . (a) Find the voltage (in V) across R1.. . . . . (b) Find the current (in A) in R1.arrow_forwardWhat is the equivalent resistor between the terminals a and b if you replace R1 by 20 Ohm and R2 by 40 Ohm ? This combination of resistors goes to infinity by repeating itself. Write your answer in units of Ohm. No decimal points is necessary. Maximum od 4% of error is accepted in your answer. R1 R, R2 R2 b. R1 R,arrow_forward
- Express your final answer in proper ENG notation and unit. Observe 2-5 decimal places. A battery has an EMF of 24.0 V and an internal resistance of 7. Its terminals are connected to a 1. load resistance of 5.25 N. a. Find r and current in the circuit if the terminal voltage of the battery is 22.5V. b. Calculate the power delivered to the load resistor, the power delivered to the internal resistance, and the power delivered by the battery.arrow_forwardI have attached the formulas and values tahat we use for reference. Please include a detailed solution. Thank you! Question:When two resistors A and B are connected in series, the total resistance is 36 ohms. When connected in parallel, the total resistance is 8 ohms. What is the ratio of the resistance RA to resistance RB? Assume RA < RB and express the answer in decimal form.arrow_forwardWhat is the output voltage of a 3.00-V lithium cell in a digital wristwatch that draws 0.660 mA, if the cell's internal resistance is 2.15 Ω? (Enter your answer to at least five significant figures.)Varrow_forward
- Answer must be in standard form scientific notation with SI units that do not have prefixes except for kg. Provide the answer with the correct amount of significant figures. Thank you so much I greatly appreciate itarrow_forwardR₁ R₂ ww R 6 R 5arrow_forwarda) Use voltage division to determine the voltage v, across the 40 N resistor in the circuit shown. 3.4 b) Use v, from part (a) to determine the cur- rent through the 40 N resistor, and use this current and current division to calculate the current in the 30 N resistor. c) How much power is absorbed by the 50 N resistor? 40 Q 50 Ω + v, 60 V 20 Ωξ 30 Ωξ 10 Ω 70 N Answer: (a) 20 V; (b) 166.67 mA; (c) 347.22 mW. + |arrow_forward
- 9.arrow_forwardConsider the circuit shown below. (Due to the nature of this problem, do not use rounded intermediate values in your calculations including answers submitted in WebAssign.) VR1 = VRA VRS = R, = 56 ΚΩ 14 ΚΩ R₁ = = EV₁ = 19 V R₂ = 14 kn (a) Find the voltage across each resistor (in V). = 2.37 = 9.49 2.37 2.37 = 2.37 V V V = 14 ΚΩ V R3 = V₂ = 38 V R₁ = 14 k (b) What is the power (in mW) supplied to the circuit and the power dissipated or consumed by the circuit? P. in mw Pout mWarrow_forwardWhat is the output voltage of a 3 V lithium cell in a digital wristwatch that draws 0.32 mA, if the cell's internal resistance is 1.8 Q? Hint: Draw a circuit diagram of the lithium battery in your notebook. Label all currents and voltages. Enter a value correct to 5 significant figures. V₂ = Varrow_forward
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