Question 1

If R1 2 3,and if these resistors are connected in parallel in a circuit,which one has the highest current?

Accepted Answer

A) R1 
B) R2 
C) R3 
D) All have the same current. 
A) R1 
B) R2 
C) R3 
D) All have the same current. A

Question 2

A battery with an emf of 12.0 V has a terminal voltage of 11.25 V when the current is 3.15 A.What is the load resistance,R?

Accepted Answer

A) 0.238 Ω 
B) 2.34 Ω 
C) 3.57 Ω 
D) 7.38 Ω 
A) 0.238 Ω 
B) 2.34 Ω 
C) 3.57 Ω 
D) 7.38 Ω C

Question 3

The basic function of an electromotive force in a circuit is to do which of the following?

Accepted Answer

A) Convert electrical energy into some other form of energy. 
B) Convert some other form of energy into electrical energy. 
C) Both choices (a)and (b)are valid. 
D) None of the above choices are valid. 
A) Convert electrical energy into some other form of energy. 
B) Convert some other form of energy into electrical energy. 
C) Both choices (a)and (b)are valid. 
D) None of the above choices are valid. B

Question 4

When a 20.8-Ω resistor is connected across a 15.6-V battery,a current of 500 mA flows.What is the internal resistance of the battery?

Accepted Answer

A) 20.8 Ω 
B) 10.4 Ω 
C) 31.2 Ω 
D) 0.732 Ω 
E) 1.25 Ω 
A) 20.8 Ω 
B) 10.4 Ω 
C) 31.2 Ω 
D) 0.732 Ω 
E) 1.25 Ω

Question 5

Household circuits are wired in ________.

Accepted Answer

A) series 
B) parallel 
C) both series and parallel 
D) neither series nor parallel 
A) series 
B) parallel 
C) both series and parallel 
D) neither series nor parallel

Question 6

The ammeter shown in the figure reads 4.4 A,RS1U1B11S1U1B0 = 7.0 Ω,RS1U1B12S1U1B0 = 5.0 Ω,and RS1U1B13S1U1B0 = 2.0 Ω.  
-What is the resistance of the bulb?

Accepted Answer

A) 0.079 Ω 
B) 1.5 Ω 
C) 5.2 Ω 
D) 5.6 Ω 
A) 0.079 Ω 
B) 1.5 Ω 
C) 5.2 Ω 
D) 5.6 Ω

Question 7

Three resistors connected in parallel have the individual voltages labeled ΔV1,ΔV2 and ΔV3,respectively.Which of the following expresses the total voltage ΔVT across the three resistors when connected in this manner?

Accepted Answer

A) ΔVT = ΔV1 + ΔV2 + ΔV3 
B) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3) 
C) ΔVT = ΔV1 = ΔV2 = ΔV3 
D) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3)−1 
A) ΔVT = ΔV1 + ΔV2 + ΔV3 
B) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3) 
C) ΔVT = ΔV1 = ΔV2 = ΔV3 
D) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3)−1

Question 8

What is the potential difference between points a and b?

Accepted Answer

A) 6.0 V 
B) 8.0 V 
C) 12 V 
D) 24 V 
A) 6.0 V 
B) 8.0 V 
C) 12 V 
D) 24 V

Question 9

A series RC circuit has a time constant of 1.0 s.The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA.The capacitor is initially uncharged.What is the charge on the capacitor 2.0 s after the switch is closed?

Accepted Answer

A) 0.43 C 
B) 0 66 C 
C) 0.86 C 
D) 0.99 C 
A) 0.43 C 
B) 0 66 C 
C) 0.86 C 
D) 0.99 C

Question 10

In the circuit segment shown if I = 7 mA and Q = 50 µC,what is the potential difference,VA - VB?

Accepted Answer

A) −40 V 
B) +40 V 
C) +20 V 
D) -20 V 
A) −40 V 
B) +40 V 
C) +20 V 
D) -20 V

Question 11

A circuit contains a 6.0-V battery,a 4.0-Ω resistor,a 0.60-µF capacitor,an ammeter,and a switch all in series.What will be the current reading immediately after the switch is closed?

Accepted Answer

A) zero 
B) 0.75 A 
C) 1.5 A 
D) 10 A 
A) zero 
B) 0.75 A 
C) 1.5 A 
D) 10 A

Question 12

Using a resistor and two different value capacitors,which of the following combinations in an RC circuit would give the greatest time constant?

Accepted Answer

A) the resistor in series with both capacitors in series with each other 
B) the resistor in series with both capacitors in parallel with each other 
C) the resistor in series with the larger value capacitor 
D) the resistor in series with the lower value capacitor 
A) the resistor in series with both capacitors in series with each other 
B) the resistor in series with both capacitors in parallel with each other 
C) the resistor in series with the larger value capacitor 
D) the resistor in series with the lower value capacitor

Question 13

When a 27.0-Ω resistor is connected across a 4.50-V battery,a current of 473 mA flows.What is the resulting terminal voltage of the battery?

Accepted Answer

A) 30.7 V 
B) 6.86 V 
C) 12.8 V 
D) 57.1 V 
E) 0.537 V 
A) 30.7 V 
B) 6.86 V 
C) 12.8 V 
D) 57.1 V 
E) 0.537 V

Question 14

An uncharged,series RC circuit is connected across a battery.For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged?​

Accepted Answer

A) ​The RC time constant is doubled. 
B) ​The battery voltage is doubled. 
C) ​A second resistor is added in series with the original resistor. 
D) ​All of these situations result in the time for the capacitor to reach 90% of its final charge to change. 
A) ​The RC time constant is doubled. 
B) ​The battery voltage is doubled. 
C) ​A second resistor is added in series with the original resistor. 
D) ​All of these situations result in the time for the capacitor to reach 90% of its final charge to change.

Question 15

If ε = 9.0 V,what is the current in the 15-Ω resistor?

Accepted Answer

A) 0.20 A 
B) 0.30 A 
C) 0.10 A 
D) 0.26 A 
A) 0.20 A 
B) 0.30 A 
C) 0.10 A 
D) 0.26 A

Question 16

In a circuit,a current of 1.10 A is drawn from a battery.The current then divides and passes through two resistors in parallel.One of the resistors has a value of 66 Ω and the current through it is 0.480 A.What is the value of the other resistor?

Accepted Answer

A) 28.8 Ω 
B) 51.1 Ω 
C) 151 Ω 
D) 20.1 Ω 
A) 28.8 Ω 
B) 51.1 Ω 
C) 151 Ω 
D) 20.1 Ω

Question 17

The ammeter shown in the figure reads 4.4 A,RS1U1B11S1U1B0 = 7.0 Ω,RS1U1B12S1U1B0 = 5.0 Ω,and RS1U1B13S1U1B0 = 2.0 Ω.  
-What percent of the dissipated power is dissipated in the batteries?

Accepted Answer

A) 10.2% 
B) 6.3% 
C) 1.6% 
D) 1.9% 
A) 10.2% 
B) 6.3% 
C) 1.6% 
D) 1.9%

Question 18

To find the equivalent resistance of the combination of resistors shown below by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel,the first step would be which of the following?

Accepted Answer

A) Combine the 6.0 Ω and the 7.0 Ω in series. 
B) Combine either the 4.0 Ω and the 10.0 Ω in parallel or the 7.0 Ω and the 10.0 Ω in parallel first,since either could be the first step with the other the second step. 
C) Combine the 4.0 Ω and the 10.0 Ω in series. 
D) Combine the 6.0 Ω,the 4.0 Ω,and the 10.0 Ω in series in a single step. 
A) Combine the 6.0 Ω and the 7.0 Ω in series. 
B) Combine either the 4.0 Ω and the 10.0 Ω in parallel or the 7.0 Ω and the 10.0 Ω in parallel first,since either could be the first step with the other the second step. 
C) Combine the 4.0 Ω and the 10.0 Ω in series. 
D) Combine the 6.0 Ω,the 4.0 Ω,and the 10.0 Ω in series in a single step.

Question 19

Three resistors,each with resistance R1,are in parallel in a circuit.They are replaced by one equivalent resistor,R.Compare this resistor to the first resistor of the initial circuit.Which of the following statements is true?

Accepted Answer

A) The current through R equals the current through R1. 
B) The voltage across R equals the voltage across R1. 
C) The power given off by R equals the power given off by R1. 
D) R is greater than R1. 
A) The current through R equals the current through R1. 
B) The voltage across R equals the voltage across R1. 
C) The power given off by R equals the power given off by R1. 
D) R is greater than R1.

Question 20

What is the current flowing through the 4-Ω resistor?

Accepted Answer

A) 1 A 
B) 2 A 
C) 3 A 
D) 6 A 
A) 1 A 
B) 2 A 
C) 3 A 
D) 6 A

Exam 18: Direct-Current Circuits

If R1 < R2 < R3,and if these resistors are connected in parallel in a circuit,which one has the highest current?

A battery with an emf of 12.0 V has a terminal voltage of 11.25 V when the current is 3.15 A.What is the load resistance,R?

The basic function of an electromotive force in a circuit is to do which of the following?

When a 20.8-Ω resistor is connected across a 15.6-V battery,a current of 500 mA flows.What is the internal resistance of the battery?

Household circuits are wired in ________.

The ammeter shown in the figure reads 4.4 A,R1 = 7.0 Ω,R2 = 5.0 Ω,and R3 = 2.0 Ω. -What is the resistance of the bulb?

Three resistors connected in parallel have the individual voltages labeled ΔV1,ΔV2 and ΔV3,respectively.Which of the following expresses the total voltage ΔVT across the three resistors when connected in this manner?

What is the potential difference between points a and b?

A series RC circuit has a time constant of 1.0 s.The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA.The capacitor is initially uncharged.What is the charge on the capacitor 2.0 s after the switch is closed?

In the circuit segment shown if I = 7 mA and Q = 50 µC,what is the potential difference,VA - VB?

A circuit contains a 6.0-V battery,a 4.0-Ω resistor,a 0.60-µF capacitor,an ammeter,and a switch all in series.What will be the current reading immediately after the switch is closed?

Using a resistor and two different value capacitors,which of the following combinations in an RC circuit would give the greatest time constant?

When a 27.0-Ω resistor is connected across a 4.50-V battery,a current of 473 mA flows.What is the resulting terminal voltage of the battery?

An uncharged,series RC circuit is connected across a battery.For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged?​

If ε = 9.0 V,what is the current in the 15-Ω resistor?

In a circuit,a current of 1.10 A is drawn from a battery.The current then divides and passes through two resistors in parallel.One of the resistors has a value of 66 Ω and the current through it is 0.480 A.What is the value of the other resistor?

The ammeter shown in the figure reads 4.4 A,R1 = 7.0 Ω,R2 = 5.0 Ω,and R3 = 2.0 Ω. -What percent of the dissipated power is dissipated in the batteries?

To find the equivalent resistance of the combination of resistors shown below by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel,the first step would be which of the following?

Three resistors,each with resistance R1,are in parallel in a circuit.They are replaced by one equivalent resistor,R.Compare this resistor to the first resistor of the initial circuit.Which of the following statements is true?

What is the current flowing through the 4-Ω resistor?

Units, Trigonometry, and Vectors

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Newtons Laws of Motion

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Filters

If R₁ < R₂ < R₃,and if these resistors are connected in parallel in a circuit,which one has the highest current?

The ammeter shown in the figure reads 4.4 A,R₁ = 7.0 Ω,R₂ = 5.0 Ω,and R₃ = 2.0 Ω. -What is the resistance of the bulb?

Three resistors connected in parallel have the individual voltages labeled ΔV₁,ΔV₂ and ΔV₃,respectively.Which of the following expresses the total voltage ΔV_T across the three resistors when connected in this manner?

In the circuit segment shown if I = 7 mA and Q = 50 µC,what is the potential difference,V_A - V_B?

An uncharged,series RC circuit is connected across a battery.For which situation will the time for the capacitor to reach 90% of its final charge remain unchanged?

The ammeter shown in the figure reads 4.4 A,R₁ = 7.0 Ω,R₂ = 5.0 Ω,and R₃ = 2.0 Ω. -What percent of the dissipated power is dissipated in the batteries?

Three resistors,each with resistance R₁,are in parallel in a circuit.They are replaced by one equivalent resistor,R.Compare this resistor to the first resistor of the initial circuit.Which of the following statements is true?