Question 1

Four resistors are connected across an 8-V DC battery as shown in the figure. The current through the 9-Ω resistor is closest to

Accepted Answer

A)  1 A. 
B)  0.7 A. 
C)  0.5 A. 
D)  0.9 A. 
E)  2 A. 
A)  1 A. 
B)  0.7 A. 
C)  0.5 A. 
D)  0.9 A. 
E)  2 A.

Question 2

When four identical resistors are connected to an ideal battery of voltage V = 10 V as shown in the figure, the current I is equal to 0.20 A. What is the value of the resistance R of the resistors?

Accepted Answer

A)  20 Ω 
B)  40 Ω 
C)  30 Ω 
D)  50 Ω 
E)  10 Ω 
A)  20 Ω 
B)  40 Ω 
C)  30 Ω 
D)  50 Ω 
E)  10 Ω

Question 3

For the circuit shown in the figure, the current in the 8-Ω resistor is 0.50 A, and all quantities are accurate to 2 significant figures. What is the current in the 2-Ω resistor?

Accepted Answer

A)  2.25 A 
B)  0.75 A 
C)  4.5 A 
D)  9.5 A 
E)  6.4 A 
A)  2.25 A 
B)  0.75 A 
C)  4.5 A 
D)  9.5 A 
E)  6.4 A

Question 4

When a 100-Ω resistor is connected across the terminals of a battery of emf ε and internal resistance r, the battery delivers 0.794 W of power to the 100-Ω resistor. When the 100-Ω resistor is replaced by a 200-Ω resistor, the battery delivers 0.401 W of power to the 200-Ω resistor. What are the emf and internal resistance of the battery?

Accepted Answer

A)  ε = 10.0 V, r = 5.02 Ω 
B)  ε = 4.50 V, r = 4.00 Ω 
C)  ε = 9.00 V, r = 2.04 Ω 
D)  ε = 9.00 V, r = 1.01 Ω 
E)  ε = 12.0 V, r = 6.00 Ω 
A)  ε = 10.0 V, r = 5.02 Ω 
B)  ε = 4.50 V, r = 4.00 Ω 
C)  ε = 9.00 V, r = 2.04 Ω 
D)  ε = 9.00 V, r = 1.01 Ω 
E)  ε = 12.0 V, r = 6.00 Ω

Question 5

A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. Compared to the polarity shown in the figure, the emf ε1 is closest to

Accepted Answer

A)  -5 V. 
B)  5 V. 
C)  45 V. 
D)  51 V. 
E)  -51 V. 
A)  -5 V. 
B)  5 V. 
C)  45 V. 
D)  51 V. 
E)  -51 V.

Question 6

A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?

Accepted Answer

A)  90 mA 
B)  1.0 A 
C)  5.0 A 
D)  11 A 
E)  14 A 
A)  90 mA 
B)  1.0 A 
C)  5.0 A 
D)  11 A 
E)  14 A

Question 7

An RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 s. Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

Accepted Answer

A)  The capacitor charges to its maximum value in one time constant and the current is zero at that time. 
B)  The potential difference across the resistor and the potential difference across the capacitor are always equal. 
C)  The potential difference across the resistor is always greater than the potential difference across the capacitor. 
D)  The potential difference across the capacitor is always greater than the potential difference across the resistor 
E)  Once the capacitor is essentially fully charged, there is no appreciable current in the circuit. 
A)  The capacitor charges to its maximum value in one time constant and the current is zero at that time. 
B)  The potential difference across the resistor and the potential difference across the capacitor are always equal. 
C)  The potential difference across the resistor is always greater than the potential difference across the capacitor. 
D)  The potential difference across the capacitor is always greater than the potential difference across the resistor 
E)  Once the capacitor is essentially fully charged, there is no appreciable current in the circuit.

Question 8

The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage Vab is equal to 17.4 V, what is the current through the battery, including its direction?

Accepted Answer

A)  6.8 A, from b to a 
B)  8.7 A, from b to a 
C)  6.8 A, from a to b 
D)  8.7 A, from a to b 
E)  16 A, from b to a 
A)  6.8 A, from b to a 
B)  8.7 A, from b to a 
C)  6.8 A, from a to b 
D)  8.7 A, from a to b 
E)  16 A, from b to a

Exam 28: Fundamentals of Circuits

Four resistors are connected across an 8-V DC battery as shown in the figure. The current through the 9-Ω resistor is closest to

When four identical resistors are connected to an ideal battery of voltage V = 10 V as shown in the figure, the current I is equal to 0.20 A. What is the value of the resistance R of the resistors?

For the circuit shown in the figure, the current in the 8-Ω resistor is 0.50 A, and all quantities are accurate to 2 significant figures. What is the current in the 2-Ω resistor?

A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. Compared to the polarity shown in the figure, the emf ε1 is closest to

A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?

An RC circuit is connected across an ideal DC voltage source through an open switch. The switch is closed at time t = 0 s. Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage Vab is equal to 17.4 V, what is the current through the battery, including its direction?

Concepts of Motion

Kinematics in One Dimension

Vectors and Coordinate Systems

Kinematics in Two Dimensions

Force and Motion

Dynamics I: Motion Along a Line

Newtons Third Law

Dynamics Ii: Motion in a Plane

Work and Kinetic Energy

Interactions and Potential Energy

Impulse and Momentum

Rotation of a Rigid Body

Newtons Theory of Gravity

Fluids and Elasticity

Oscillations

Traveling Waves

Superposition

A Macroscopic Description of Matter

Work, Heat, and the First Law of Thermodynamics

The Micromacro Connection

Heat Engines and Refrigerators

Electric Charges and Forces

The Electric Field

Gausss Law

The Electric Potential

Potential and Field

Current and Resistance

The Magnetic Field

Electromagnetic Induction

Electromagnetic Fields and Waves

Ac Circuits

Wave Optics

Ray Optics

Optical Instruments

Relativity

The Foundations of Modern Physics

Quantization

Wave Functions and Uncertainty

One-Dimensional Quantum Mechanics

Atomic Physics

Nuclear Physics

Filters

A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. Compared to the polarity shown in the figure, the emf ε₁is closest to

The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage V_ab is equal to 17.4 V, what is the current through the battery, including its direction?