 21.1: A switch has a variable resistance that is nearly zero when closed ...
 21.2: What is the voltage across the open switch in Figure 21.46?
 21.3: There is a voltage across an open switch, such as in Figure 21.46. ...
 21.4: Why is the power dissipated by a closed switch, such as in Figure 2...
 21.5: A student in a physics lab mistakenly wired a light bulb, battery, ...
 21.6: Knowing that the severity of a shock depends on the magnitude of th...
 21.7: Would your headlights dim when you start your cars engine if the wi...
 21.8: Some strings of holiday lights are wired in series to save wiring c...
 21.9: If two household lightbulbs rated 60 W and 100 W are connected in s...
 21.10: Suppose you are doing a physics lab that asks you to put a resistor...
 21.11: Before World War II, some radios got power through a resistance cor...
 21.12: Some light bulbs have three power settings (not including zero), ob...
 21.13: Is every emf a potential difference? Is every potential difference ...
 21.14: Explain which battery is doing the charging and which is being char...
 21.15: Given a battery, an assortment of resistors, and a variety of volta...
 21.16: Two different 12V automobile batteries on a store shelf are rated ...
 21.17: What are the advantages and disadvantages of connecting batteries i...
 21.18: Semitractor trucks use four large 12V batteries. The starter syste...
 21.19: Can all of the currents going into the junction in Figure 21.49 be ...
 21.20: Apply the junction rule to junction b in Figure 21.50. Is any new i...
 21.21: (a) What is the potential difference going from point a to point b ...
 21.22: Apply the loop rule to loop afedcba in Figure 21.50.
 21.23: Apply the loop rule to loops abgefa and cbgedc in Figure 21.50.
 21.24: Why should you not connect an ammeter directly across a voltage sou...
 21.25: Suppose you are using a multimeter (one designed to measure a range...
 21.26: Specify the points to which you could connect a voltmeter to measur...
 21.27: To measure currents in Figure 21.52, you would replace a wire betwe...
 21.28: Why can a null measurement be more accurate than one using standard...
 21.29: If a potentiometer is used to measure cell emfs on the order of a f...
 21.30: Regarding the units involved in the relationship = RC , verify that...
 21.31: The RC time constant in heart defibrillation is crucial to limiting...
 21.32: When making an ECG measurement, it is important to measure voltage ...
 21.33: Draw two graphs of charge versus time on a capacitor. Draw one for ...
 21.34: When charging a capacitor, as discussed in conjunction with Figure ...
 21.35: When discharging a capacitor, as discussed in conjunction with Figu...
 21.36: Referring to Figure 21.41, draw a graph of potential difference acr...
 21.37: A long, inexpensive extension cord is connected from inside the hou...
 21.38: In Figure 21.44, does the graph indicate the time constant is short...
 21.39: An electronic apparatus may have large capacitors at high voltage i...
 21.40: Find the currents flowing in the circuit in Figure 21.50.
 21.41: Unreasonable Results Consider the circuit in Figure 21.56, and supp...
 21.42: What is the sensitivity of the galvanometer (that is, what current ...
 21.43: What is the sensitivity of the galvanometer (that is, what current ...
 21.44: Find the resistance that must be placed in series with a 25.0 galv...
 21.45: Find the resistance that must be placed in series with a 25.0 galv...
 21.46: Find the resistance that must be placed in parallel with a 25.0 ga...
 21.47: Find the resistance that must be placed in parallel with a 25.0 ga...
 21.48: Find the resistance that must be placed in series with a 10.0 galv...
 21.49: Find the resistance that must be placed in parallel with a 10.0 ga...
 21.50: Suppose you measure the terminal voltage of a 1.585V alkaline cell...
 21.51: Suppose you measure the terminal voltage of a 3.200V lithium cell ...
 21.52: A certain ammeter has a resistance of 5.00105 on its 3.00A scale a...
 21.53: A 1.00M voltmeter is placed in parallel with a 75.0k resistor in ...
 21.54: A 0.0200 ammeter is placed in series with a 10.00 resistor in a c...
 21.55: Unreasonable Results Suppose you have a 40.0 galvanometer with a 2...
 21.56: Unreasonable Results (a) What resistance would you put in parallel ...
 21.57: What is the emfx of a cell being measured in a potentiometer, if th...
 21.58: Calculate the emfx of a dry cell for which a potentiometer is balan...
 21.59: When an unknown resistance Rx is placed in a Wheatstone bridge, it ...
 21.60: To what value must you adjust R3 to balance a Wheatstone bridge, if...
 21.61: (a) What is the unknown emfx in a potentiometer that balances when ...
 21.62: Suppose you want to measure resistances in the range from 10.0 to 1...
 21.63: The timing device in an automobiles intermittent wiper system is ba...
 21.64: A heart pacemaker fires 72 times a minute, each time a 25.0nF capa...
 21.65: The duration of a photographic flash is related to an RC time const...
 21.66: A 2.00 and a 7.50F capacitor can be connected in series or parall...
 21.67: After two time constants, what percentage of the final voltage, emf...
 21.68: A 500 resistor, an uncharged 1.50F capacitor, and a 6.16V emf ar...
 21.69: A heart defibrillator being used on a patient has an RC time consta...
 21.70: An ECG monitor must have an RC time constant less than 1.00102 s to...
 21.71: Figure 21.58 shows how a bleeder resistor is used to discharge a ca...
 21.72: Using the exact exponential treatment, find how much time is requir...
 21.73: Using the exact exponential treatment, find how much time is requir...
 21.74: Integrated Concepts If you wish to take a picture of a bullet trave...
 21.75: Integrated Concepts A flashing lamp in a Christmas earring is based...
 21.76: Integrated Concepts A 160F capacitor charged to 450 V is discharge...
 21.77: Unreasonable Results (a) Calculate the capacitance needed to get an...
 21.78: Construct Your Own a cameras flash unit. Construct a problem in whi...
 21.79: Construct Your Own a rechargeable lithium cell that is to be used t...
Solutions for Chapter 21: CIRCUITS, BIOELECTRICITY, AND DC INSTRUMENTS
Full solutions for College Physics for AP® Courses  1st Edition
ISBN: 9781938168932
Solutions for Chapter 21: CIRCUITS, BIOELECTRICITY, AND DC INSTRUMENTS
Get Full SolutionsThis textbook survival guide was created for the textbook: College Physics for AP® Courses, edition: 1. College Physics for AP® Courses was written by and is associated to the ISBN: 9781938168932. Since 79 problems in chapter 21: CIRCUITS, BIOELECTRICITY, AND DC INSTRUMENTS have been answered, more than 18428 students have viewed full stepbystep solutions from this chapter. This expansive textbook survival guide covers the following chapters and their solutions. Chapter 21: CIRCUITS, BIOELECTRICITY, AND DC INSTRUMENTS includes 79 full stepbystep solutions.

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parallel

any symbol
average (indicated by a bar over a symbol—e.g., v¯ is average velocity)

°C
Celsius degree

°F
Fahrenheit degree