The Physics of Everyday Phenomena: A Conceptual Introduction to Physics

W. Thomas Griffith, Juliet Wain Brosing

Chapter 13

Electric Circuits - all with Video Answers

Educators

Chapter Questions

Problem 1

Two arrangements of a battery, bulb, and wire are shown below. Which of the two arrangements, if either, will light the bulb? Explain.

Vishal Gupta

Vishal Gupta

Numerade Educator

Problem 2

Suppose that you have two wires, a battery, and a bulb. One of the wires is already in place in each of the arrangements shown in the next column. Indicate with a drawing where you would place the second wire to get the bulb to light. Explain your decision in each case.

Vishal Gupta

Numerade Educator

Problem 3

In a simple battery-and-bulb circuit, is the electric current that enters the bulb on the side nearer to the positive terminal of the battery larger than the current that leaves the bulb on the opposite side? Explain.

Vishal Gupta

Numerade Educator

Problem 4

Are electric current and electric charge the same thing? Explain.

Vishal Gupta

Numerade Educator

Problem 5

Consider the circuit shown, where the wires are connected to either side of a wooden block as well as to the light bulb. Will the bulb light in this arrangement? Explain.

Vishal Gupta

Numerade Educator

Problem 6

Consider the circuit shown. Could we increase the brightness of the bulb by connecting a wire between points $\mathrm{A}$ and B? Explain.

Vishal Gupta

Numerade Educator

Problem 7

Two circuit diagrams are shown. Which one, if either, will cause the light bulb to light? Explain your analysis of each

Vishal Gupta

Numerade Educator

Problem 8

Suppose that we use an uncoated metal clamp to hold the wires in place in the battery-and-bulb circuit shown. Will this be effective in keeping the bulb burning brightly? Explain.

Vishal Gupta

Numerade Educator

Problem 9

Consider the two signs shown, located in different physics labs. Which of the two would be reason for greater caution? Explain.

Vishal Gupta

Numerade Educator

Problem 10

If we decrease the potential difference across a resistance in a circuit, will the current flowing through that resistance increase, remain the same, or decrease? Explain.

Vishal Gupta

Numerade Educator

Problem 11

A dead battery will still indicate a voltage when a good voltmeter is connected across the terminals. Can the battery still be used to light a light bulb? Explain.

Vishal Gupta

Numerade Educator

Problem 12

When a battery is being used in a circuit, will the voltage across its terminals be less than that measured when there is no current being drawn from the battery? Explain.

Vishal Gupta

Numerade Educator

Problem 13

Two resistors are connected in series with a battery as shown in the diagram. $R_{1}$ is less than $R_{2}$.
a. Which of the two resistors, if either, has the greater current flowing through it? Explain.
b. Which of the two resistors, if either, has the greatest voltage difference across it? Explain.

Vishal Gupta

Numerade Educator

Problem 14

In the circuit shown below, $R_{1}, R_{2},$ and $R_{3}$ are three resistors of different values. $R_{3}$ is greater than $R_{2},$ and $R_{2}$ is greater than $R_{1} . \mathcal{E}$ is the electromotive force of the battery whose internal resistance is negligible. Which of the three resistors has the greatest current flowing through it? Explain.

Vishal Gupta

Numerade Educator

Problem 15

In the circuit shown in question $14,$ which of the three resistors, if any, has the largest voltage difference across it? Explain.

Vishal Gupta

Numerade Educator

Problem 16

If we disconnect $R_{2}$ from the rest of the circuit shown in the diagram for question $14,$ will the current through $R_{3}$ increase, decrease, or remain the same? Explain.

Vishal Gupta

Numerade Educator

Problem 17

When current passes through a series combination of resistors, does the current get smaller as it goes through each successive resistor in the combination? Explain.

Vishal Gupta

Numerade Educator

Problem 18

In the circuit shown, the circle with a $V$ in it represents a voltmeter. Which of the following statements is correct? Explain.
a. The voltmeter is in the correct position for measuring the voltage difference across $R$.
b. No current will flow through the meter, so it will have no effect.
c. The meter will draw a large current.

Vishal Gupta

Numerade Educator

Problem 19

In the circuit shown, the circle with a $V$ in it represents a voltmeter. Which of the following statements is correct? Explain.
a. The voltmeter is in the correct position for measuring the voltage difference across $R$.
b. No current will flow through the meter, so it will have no effect.
c. The meter will draw a large current.

Vishal Gupta

Numerade Educator

Problem 20

Which will normally have the larger resistance, a voltmeter or an ammeter? Explain.

Vishal Gupta

Numerade Educator

Problem 21

Is electric energy the same as electric power? Explain.

Vishal Gupta

Numerade Educator

Problem 22

If the current through a certain resistance is doubled, does the power dissipated in that resistor also double? Explain.

Vishal Gupta

Numerade Educator

Problem 23

Does the power being delivered by a battery depend on the resistance of the circuit connected to the battery? Explain.

Vishal Gupta

Numerade Educator

Problem 24

What energy source increases the potential energy of the water behind the dam of a hydroelectric power plant? Explain.

Ma Ednelyn Lim

Numerade Educator

Problem 25

Does a battery connected to an electric motor represent a perpetual-motion machine (see chapter 11 )? Explain.

Ma Ednelyn Lim

Numerade Educator

Problem 26

In using a dc voltmeter, it is important to connect the positive terminal of the meter in the correct direction in the circuit relative to the positive terminal of the battery. Is this likely to be true for the use of an ac voltmeter? Explain.

Ma Ednelyn Lim

Numerade Educator

Problem 27

Which of these appliances is most likely to cause an overload problem when connected to a circuit that already has other appliances drawing current from it: an electric shaver, a coffeemaker, or a television set? Explain.

Vishal Gupta

Numerade Educator

Problem 28

Would it make sense to connect a fuse or circuit breaker in parallel with other elements in a circuit? Explain.

Vishal Gupta

Numerade Educator

Problem 29

Suppose that the appliances connected to a household circuit were connected in series rather than in parallel. What disadvantages would there be to this arrangement? Explain.

Vishal Gupta

Numerade Educator

Problem 30

Suppose that the appliances connected to a household circuit were connected in series rather than in parallel. What disadvantages would there be to this arrangement? Explain.

Vishal Gupta

Numerade Educator