Deck 23: Circuits

Question 1

Ohm's law is a fundamental law of physics and is therefore obeyed by all materials.

Answer 1

False

Question 2

Initially,for the circuit shown,the switch S is open and the capacitor is uncharged.The switch S is closed at time t = 0.In the figure shown,when the time t is equal to 8.0 s,the charge on the capacitor,in μC,is closest to:

A)2300
B)1800
C)2700
D)3200
E)3600

Answer 2

2300

Question 3

A multiloop circuit is given.It is not necessary to solve the entire circuit.In the figure shown,the current I₂ is closest to:

A)-2 A
B)2 A
C)8 A
D)-8 A
E)zero

Answer 3

-2 A

Question 4

In the figure shown,what is the power dissipated in the 2 ohm resistance in the circuit?

A)5.33 W
B)8.0 W
C)6.67 W
D)2.67 W
E)3.56 W

Question 5

In the circuit shown,what current does the ammeter read?

A)0.10 A
B)0.078 A
C)0.21 A
D)0.14 A

Question 6

Initially,for the circuit shown,the switch S is open and the capacitor is uncharged.The switch S is closed at time t = 0.In the figure shown,when the time t is equal to 20.0 s,the potential difference across the resistor is closest to:

A)8.6 V
B)10 V
C)12 V
D)14 V
E)15 V

Question 7

What is the current through resistor R₁ in this circuit?

A)0.040 A
B)0.10 A
C)0.022 A
D)0.0089 A

Question 8

The capacitor shown in the circuit in the figure is initially uncharged when the switch S is suddenly closed.After one time constant,the current through the resistor will be closest to:

A)0.00 A
B)0.74 A
C)1.0 A
D)1.3 A
E)2.0 A

Question 9

A multiloop circuit is given.It is not necessary to solve the entire circuit.In the figure shown,the emf ε₁ is closest to:

A)-28 V
B)28 V
C)68 V
D)72 V
E)-72 V

Question 10

What is the current through resistor R₃ in this circuit?

A)0.0063 A
B)1.5 A
C)0.0045 A
D)0.013 A

Question 11

A multiloop circuit is given.It is not necessary to solve the entire circuit.In the figure shown,the current I₁ is closest to:

A)-3 A
B)3 A
C)10 A
D)-10 A
E)zero

Question 12

Refer to the figure shown.What is the current through the 4.0 Ω resistor?

A)1.5 A
B)4.0 A
C)0.43 A
D)1.1 A

Question 13

A multiloop circuit is given.It is not necessary to solve the entire circuit.In the figure shown,the potential difference V_ag is closest to:

A)-12 V
B)28 V
C)-28 V
D)-60 V
E)60 V

Question 14

What is the current through resistor R₁ in the circuit shown?

A)0.30 A
B)0.20 A
C)0.00 A
D)5.72 A

Question 15

Initially,for the circuit shown,the switch S is open and the capacitor voltage is 80 V.The switch S is closed at time t = 0.In the figure shown,the capacitor voltage when the time t is equal to 40.0 s is closest to:

A)53 V
B)60 V
C)66 V
D)73 V
E)80 V

Question 16

A 10.0 V battery is connected across two resistors in series.If the resistors have resistances of 840.0 Ω and 590.0 Ω ,what is the voltage drop across the 590.0 Ω resistor?

A)4.1 V
B)5.9 V
C)14 V
D)7.0 V

Question 17

A 1.0 μF capacitor is charged until it acquires a potential difference of 700.0 V across its plates,then the emf source is removed.If the capacitor is then discharged through a 200.0 kΩ resistance of a circuit,what is the voltage drop across the capacitor 7.0 ms later?

A)680 V
B)720 V
C)24 V
D)-25 V

Question 18

The resistors in the circuit shown each have a resistance of 600 Ω.What is the equivalent resistance of the circuit?

A)600 Ω
B)2400 Ω
C)150 Ω
D)1200 Ω

Question 19

Each of the resistors in the circuit shown have a resistance of 160.0 Ω.What is the equivalent resistance of the circuit?

A)400.0 Ω
B)640.0 Ω
C)480.0 Ω
D)160.0 Ω

Question 20

A 4.0 μF capacitor is connected in series to a resistor.If an emf source is connected in series to this arrangement,and if the voltage drop across the capacitor is one-half the applied emf .0 ms after the emf source has been connected,what is the resistance of the circuit?

A)2.9 kΩ
B)1.4 kΩ
C)0.35 kΩ
D)0.72 kΩ

Question 21

A resistor is made out of a low wire having a length L.Each end of the wire is attached to a terminal of a battery having a constant voltage Vo.A current I flows through the wire.If the wire were cut in half,making two wires of length L/2,and both wires were attached to the battery (the end of both wires attached to one terminal,and the other ends attached to the other terminal),what would be the total current flowing through the two wires?

A)4I
B)2I
C)I
D)I/2

Question 22

Of voltmeters and ammeters,which is/are connected in series?

Question 23

When a potential difference of 10 V is placed across a certain solid cylindrical resistor,the current through it is 2.0 A.If the diameter of this resistor is now tripled,the current will be 18 A.

Question 24

If the graph of the current through a resistor as a function of the potential difference across it is a straight line with a positive slope passing through the origin,the resistor obeys Ohm's law and the slope of this graph is equal to the resistance of this resistor.

Question 25

How are the two batteries in the figure connected? State whether they are in parallel or in series and give the polarity of each battery at its connection to the other.

A)in series,positive to positive
B)in series,negative to negative
C)in parallel,positive to positive
D)in series,positive to negative

Question 26

Draw a circuit with two batteries,a resistor between them,and a capacitor in parallel with the resistor.The batteries are connected negative pole to positive pole.

A)

B)

C)

D)

Question 27

If a 75 W bulb and a 100 W bulb are connected in series across a 120 V outlet,the 75 W bulb will dissipate 75 W of power and the 100 W bulb will dissipate 100 W of power.

Question 28

A circuit has a branch in it.If the current in each of the two paths that leave the branch is how much current does the wire coming into the branch carry?

Question 29

The potential across the terminals of a store-bought 1.5 V AAA battery always remains at 1.5 V unless the battery has gone dead.

Question 30

Why is it appropriate that electromotive force be measured in volts?

Question 31

The high potential end of a resistor is the end at which the current enters it.

Question 32

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Through which resistor is energy being dissipated at the higher rate?

A)the 10 Ω resistor
B)the 5 Ω resistor
C)Energy is being dissipated by both resistors at the same rate.

Question 33

Which will drain a battery faster,a circuit with a resistance of 10 kΩ or a circuit with a resistance of 1Ω?

Question 34

Draw a circuit consisting of a battery connected to two resistors,R₁ and R₂,in series with each other and a capacitor C connected across the resistors.

A)

B)

C)

D)

Question 35

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Which statement is true?

A)The current at A is equal to the current at B,which is equal to the current at C,which is equal to the current at D.
B)The current at A is greater than the current at B,which is equal to the current at C,which is greater than the current at D.
C)The current at A is greater than the current at B,which is greater than the current at C,which is greater than the current at D.

Question 36

A circuit requires a 500 Ω resistor,but all that is available are 1 kΩ resistors.If the 1 kΩ resistors are in abundant supply,how can they be combined to achieve the desired resistance?

Question 37

Identical lightbulbs are attached to identical batteries,as shown in the figure.The ranking (from lowest to highest)of the total power emitted from the lightbulb(s)is:

A)y,z,x
B)x,y,z
C)z,y,x
D)x,z,y
E)z,x,y

Question 38

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.Which statement is true?

A)The current at A is equal to the current at B,which is equal to the current at C,which is equal to the current at D.
B)The current at A is greater than the current at B,which is equal to the current at C,which is greater than the current at D.
C)The current at A is greater than the current at B,which is greater than the current at C,which is greater than the current at D.

Question 39

Draw a circuit with a battery connected to four resistors,R₁,R₂,R₃,and R₄.Resistors R₁ and R₂ are connected in parallel,resistors R₃ and R₄ are connected in parallel,and both parallel pairs of resistors are connected in series.

A)

B)

C)

D)

Question 40

In a discharging RC circuit,it takes one time constant for the capacitor to discharge completely.

Question 41

Identical batteries are connected in different arrangements to the same lightbulb,as shown in the figure.For which arrangement will the bulb shine the brightest?

A)A
B)B
C)C

Question 42

A 9 V battery is hooked up to two resistors in series.One has a resistance of 5 Ω,and the other has a resistance of 10 Ω.Several locations along the circuit are marked with letters,as shown in the figure.If the voltage is zero at the negative terminal of the battery,the voltage at location B is

A)greater than 4.5 V.
B)less than 4.5 V.
C)zero.
D)4.5 V.

Question 43

In the circuit shown,the resistor R₂ is adjustable.As its resistance is made larger,the voltage at point A

A)increases.
B)decreases.
C)does not change.

Question 44

Identical batteries are connected in different arrangements to the same lightbulb,as shown in the figure.For which arrangement will the bulb shine the least?

A)w
B)x
C)y
D)z