Question 1

Negative temperature coefficients of resistivity

Accepted Answer

A)  never occur. 
B)  occur in insulators. 
C)  occur in conductors. 
D)  occur in semiconductors. 
A)  never occur. 
B)  occur in insulators. 
C)  occur in conductors. 
D)  occur in semiconductors. D

Question 2

In metric units the dimensions of resistivity are

Accepted Answer

A)  ohm. 
B)  ohm·second. 
C)  ohm·meter. 
D)  ohm/meter. 
A)  ohm. 
B)  ohm·second. 
C)  ohm·meter. 
D)  ohm/meter. C

Question 3

A hair dryer that draws 6.0 A when operating across a 110-V potential has a resistance of

Accepted Answer

A)  0.05 $\Omega$. 
B)  18  $\Omega$. 
C)  660  $\Omega$. 
D)  180  $\Omega$. 
A)  0.05 $\Omega$. 
B)  18  $\Omega$. 
C)  660  $\Omega$. 
D)  180  $\Omega$. B

Question 4

A 100- $\Omega$ resistor and a 200- $\Omega$ resistor are connected in series. These two are then connected in parallel to a 150- $\Omega$resistor. The equivalent resistance of the set is

Accepted Answer

A)  50  $\Omega$. 
B)  100  $\Omega$. 
C)  200  $\Omega$. 
D)  450 $\Omega$. 
A)  50  $\Omega$. 
B)  100  $\Omega$. 
C)  200  $\Omega$. 
D)  450 $\Omega$.

Question 5

The resistance of a wire is 1.2  $\Omega$. The potential difference across the wire when 150 C pass through the wire in 15 seconds is

Accepted Answer

A)  1.2 V. 
B)  12 V. 
C)  120 V. 
D)  120 mV. 
A)  1.2 V. 
B)  12 V. 
C)  120 V. 
D)  120 mV.

Question 6

A 10- $\Omega$ resistor is connected in parallel with a 30- $\Omega$resistor. The total resistance of the combination is

Accepted Answer

A)  7.5  $\Omega$ 
B)  15  $\Omega$. 
C)  40  $\Omega$. 
D)  300  $\Omega$ 
A)  7.5  $\Omega$ 
B)  15  $\Omega$. 
C)  40  $\Omega$. 
D)  300  $\Omega$

Question 7

The length of a wire is halved, and its radius is doubled. The resistance will change by a factor of

Accepted Answer

A)  4 
B)  2 
C)  1/2. 
D)  1/4. 
E)  1/8. 
A)  4 
B)  2 
C)  1/2. 
D)  1/4. 
E)  1/8.

Question 8

Two resistors are connected in parallel, and the value of R1 is twice the value of R2. The resistor with the larger potential across it is

Accepted Answer

A)  R1. 
B)  R2. 
C)  Both resistors have the same potential across them. 
D)  None of the above answers is correct. 
A)  R1. 
B)  R2. 
C)  Both resistors have the same potential across them. 
D)  None of the above answers is correct.

Question 9

Given a set of three identical resistors of equal value R, the following value cannot be generated from a combination of the complete set:

Accepted Answer

A)  3R 
B)  (1/3) R 
C)  (3/2) R 
D)  (2/3) R 
E)  Hold on; all of the above are possible. 
A)  3R 
B)  (1/3) R 
C)  (3/2) R 
D)  (2/3) R 
E)  Hold on; all of the above are possible.

Question 10

A 10- $\Omega$resistor is connected in series with a 30- $\Omega$ resistor. The total resistance of the combination is

Accepted Answer

A)  7.5  $\Omega$. 
B)  15  $\Omega$. 
C)  40  $\Omega$. 
D)  300 $\Omega$. 
A)  7.5  $\Omega$. 
B)  15  $\Omega$. 
C)  40  $\Omega$. 
D)  300 $\Omega$.

Question 11

Two resistors are connected in parallel, and the value of R1 is twice the value of R2. The resistor with the larger current through it is

Accepted Answer

A)  R1. 
B)  R2. 
C)  Both resistors have the same current through them. 
D)  None of the above answers is correct. 
A)  R1. 
B)  R2. 
C)  Both resistors have the same current through them. 
D)  None of the above answers is correct.

Question 12

Two resistors, 20  $\Omega$and 30  $\Omega$, are connected in parallel. A third resistor, 24  $\Omega$, is connected in series with the parallel combination. A 36-V power source is connected to the series-parallel combination. The voltage drop across the 24- $\Omega$ resistor is

Accepted Answer

A)  36 V. 
B)  24 V. 
C)  12 V. 
D)  zero. 
A)  36 V. 
B)  24 V. 
C)  12 V. 
D)  zero.

Question 13

A filament has a resistance of 0.10  $\Omega$at 20°C. If the resistance becomes 0.14  $\Omega$when the temperature of the filament increases to 90°C, the temperature coefficient of resistance for this material is

Accepted Answer

A)  5.7 *10-3/°C. 
B)  5.7 * 10-4/°C. 
C)  4.4 * 10-3/°C. 
D)  4.4 * 10-4/°C. 
A)  5.7 *10-3/°C. 
B)  5.7 * 10-4/°C. 
C)  4.4 * 10-3/°C. 
D)  4.4 * 10-4/°C.

Question 14

In metric units the dimensions of resistance are

Accepted Answer

A)  volt. 
B)  volt·ampere. 
C)  ampere·volt. 
D)  volt/ampere. 
A)  volt. 
B)  volt·ampere. 
C)  ampere·volt. 
D)  volt/ampere.

Question 15

Five incandescent lightbulbs are connected in series. One of the bulbs burns out, causing the current through the other bulbs to

Accepted Answer

A)  increase. 
B)  decrease. 
C)  remain the same. 
D)  drop to zero. 
A)  increase. 
B)  decrease. 
C)  remain the same. 
D)  drop to zero.

Question 16

A 2.0-m-long piece of wire has a diameter of 2.0 mm and a resistance of 0.018  $\Omega$. The resistivity of the material is

Accepted Answer

A)  $2.8 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m } .$ 
B)  $1.3 \times 10 ^ { - 7 } \Omega \cdot \mathrm { m } .$ 
C)  $1.4 \times 10 ^ { - 8 } \Omega \mathrm { m } .$ 
D)  $1.3 \times 10 ^ { 4 } \Omega \cdot \mathrm { m }$ 
A)  $2.8 \times 10 ^ { - 8 } \Omega \cdot \mathrm { m } .$ 
B)  $1.3 \times 10 ^ { - 7 } \Omega \cdot \mathrm { m } .$ 
C)  $1.4 \times 10 ^ { - 8 } \Omega \mathrm { m } .$ 
D)  $1.3 \times 10 ^ { 4 } \Omega \cdot \mathrm { m }$

Question 17

A 10.0-V potential is applied across two resistors, R1 and R2, connected in series. If the potential difference across R1 is 4.0 V, the value of R2 is

Accepted Answer

A)  1/2 R1. 
B)  2/3 R1. 
C)  1.5 R1. 
D)  2 R1. 
A)  1/2 R1. 
B)  2/3 R1. 
C)  1.5 R1. 
D)  2 R1.

Question 18

A 3.0-V potential is attached to a 1000-$\Omega$ resistor. The number of electrons that pass through the wire in one hour is

Accepted Answer

A)  7.7 $\times$
 1019. 
B)  6.7 $\times$
 1019. 
C)  5.7 $\times$
 1019. 
D)  4.7 $\times$

1019. 
A)  7.7 $\times$
 1019. 
B)  6.7 $\times$
 1019. 
C)  5.7 $\times$
 1019. 
D)  4.7 $\times$

1019.

Question 19

A current that is initially1.5 A decreases linearly to zero over 2.0 seconds. The total charge that passes through the wire is

Accepted Answer

A)  1.5 C. 
B)  0.75 C. 
C)  3.0 C. 
D)  0 C. 
A)  1.5 C. 
B)  0.75 C. 
C)  3.0 C. 
D)  0 C.

Question 20

The current density of 1.5 $\times$
 105 A/m2 is uniform across a wire whose radius is 4.0 mm. The current through the outer portion of the wire between the radii of 3.0 mm and 4.0 mm is

Accepted Answer

A)  1.1 A. 
B)  2.2 A. 
C)  3.3 A. 
D)  4.4 A. 
A)  1.1 A. 
B)  2.2 A. 
C)  3.3 A. 
D)  4.4 A.

Exam 27: Currents and Ohms Law

Negative temperature coefficients of resistivity

In metric units the dimensions of resistivity are

A hair dryer that draws 6.0 A when operating across a 110-V potential has a resistance of

A 100- Ω\OmegaΩ resistor and a 200- Ω\OmegaΩ resistor are connected in series. These two are then connected in parallel to a 150- Ω\OmegaΩ resistor. The equivalent resistance of the set is

The resistance of a wire is 1.2 Ω\OmegaΩ . The potential difference across the wire when 150 C pass through the wire in 15 seconds is

A 10- Ω\OmegaΩ resistor is connected in parallel with a 30- Ω\OmegaΩ resistor. The total resistance of the combination is

The length of a wire is halved, and its radius is doubled. The resistance will change by a factor of

Two resistors are connected in parallel, and the value of R1 is twice the value of R2. The resistor with the larger potential across it is

Given a set of three identical resistors of equal value R, the following value cannot be generated from a combination of the complete set:

A 10- Ω\OmegaΩ resistor is connected in series with a 30- Ω\OmegaΩ resistor. The total resistance of the combination is

Two resistors are connected in parallel, and the value of R1 is twice the value of R2. The resistor with the larger current through it is

Two resistors, 20 Ω\OmegaΩ and 30 Ω\OmegaΩ , are connected in parallel. A third resistor, 24 Ω\OmegaΩ , is connected in series with the parallel combination. A 36-V power source is connected to the series-parallel combination. The voltage drop across the 24- Ω\OmegaΩ resistor is

A filament has a resistance of 0.10 Ω\OmegaΩ at 20°C. If the resistance becomes 0.14 Ω\OmegaΩ when the temperature of the filament increases to 90°C, the temperature coefficient of resistance for this material is

In metric units the dimensions of resistance are

Five incandescent lightbulbs are connected in series. One of the bulbs burns out, causing the current through the other bulbs to

A 2.0-m-long piece of wire has a diameter of 2.0 mm and a resistance of 0.018 Ω\OmegaΩ . The resistivity of the material is

A 10.0-V potential is applied across two resistors, R1 and R2, connected in series. If the potential difference across R1 is 4.0 V, the value of R2 is

A 3.0-V potential is attached to a 1000- Ω\OmegaΩ resistor. The number of electrons that pass through the wire in one hour is

A current that is initially1.5 A decreases linearly to zero over 2.0 seconds. The total charge that passes through the wire is

The current density of 1.5 ×\times× 105 A/m2 is uniform across a wire whose radius is 4.0 mm. The current through the outer portion of the wire between the radii of 3.0 mm and 4.0 mm is

Space, Time, and Mass

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Newtons Laws of Motion

Further Applications of Newtons Laws

Work and Energy

Conservation of Energy

Gravitation

Systems of Particles

Collisions

Rotation of a Rigid Body

Dynamics of a Rigid Body

Statics and Elasticity

Oscillations

Waves

Sound

Fluid Mechanics

The Ideal Gas

Heat

Thermodynamics

Electric Force and the Electric Charge

The Electric Field

Gauss Law

Electrostatic Potential and Energy

Capacitors and Dielectrics

Direct Current Circuits

Magnetic Force and Field

Charges and Currents in Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

Reflection, Refraction, and Optics

Interference and Diffraction

The Theory of Special Relativity

Quanta of Light

Spectral Lines, Bohrs Theory, and Quantum Mechanics

Quantum Structure of Atoms, Molecules, and Solids

Nuclei

Elementary Particles and Cosmology

Filters

A 100- $\Omega$ resistor and a 200- $\Omega$ resistor are connected in series. These two are then connected in parallel to a 150- $\Omega$ resistor. The equivalent resistance of the set is

The resistance of a wire is 1.2 $\Omega$ . The potential difference across the wire when 150 C pass through the wire in 15 seconds is

A 10- $\Omega$ resistor is connected in parallel with a 30- $\Omega$ resistor. The total resistance of the combination is

Two resistors are connected in parallel, and the value of R₁ is twice the value of R₂. The resistor with the larger potential across it is

A 10- $\Omega$ resistor is connected in series with a 30- $\Omega$ resistor. The total resistance of the combination is

Two resistors are connected in parallel, and the value of R₁ is twice the value of R₂. The resistor with the larger current through it is

Two resistors, 20 $\Omega$ and 30 $\Omega$ , are connected in parallel. A third resistor, 24 $\Omega$ , is connected in series with the parallel combination. A 36-V power source is connected to the series-parallel combination. The voltage drop across the 24- $\Omega$ resistor is

A filament has a resistance of 0.10 $\Omega$ at 20°C. If the resistance becomes 0.14 $\Omega$ when the temperature of the filament increases to 90°C, the temperature coefficient of resistance for this material is

A 2.0-m-long piece of wire has a diameter of 2.0 mm and a resistance of 0.018 $\Omega$ . The resistivity of the material is

A 10.0-V potential is applied across two resistors, R₁ and R₂, connected in series. If the potential difference across R₁ is 4.0 V, the value of R₂ is

A 3.0-V potential is attached to a 1000- $\Omega$ resistor. The number of electrons that pass through the wire in one hour is

The current density of 1.5 $\times$ 10⁵ A/m² is uniform across a wire whose radius is 4.0 mm. The current through the outer portion of the wire between the radii of 3.0 mm and 4.0 mm is