Question 1

A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?

Accepted Answer

A) 0.73 A 
B) 1.4 A 
C) 2.0 A 
D) 15 A 
A) 0.73 A 
B) 1.4 A 
C) 2.0 A 
D) 15 A

Question 2

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

Accepted Answer

A) power 
B) resistivity 
C) 1/(resistivity) 
D) resistance 
E) 1/(resistance) 
A) power 
B) resistivity 
C) 1/(resistivity) 
D) resistance 
E) 1/(resistance)

Question 3

For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?

Accepted Answer

A) 1/(resistance) 
B) resistance 
C) potential 
D) (potential)2 
E) 1/(potential) 
A) 1/(resistance) 
B) resistance 
C) potential 
D) (potential)2 
E) 1/(potential)

Question 4

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W. How much current is flowing through this bulb?

Accepted Answer

A) 1.5 A 
B) 2.5 A 
C) 0.50 A 
D) 2.0 A 
E) 1.0 A 
A) 1.5 A 
B) 2.5 A 
C) 0.50 A 
D) 2.0 A 
E) 1.0 A

Question 5

The resistivity of the material of a wire is 1.76 × 10-8 Ω ∙ m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance?

Accepted Answer

A) 112 Ω 
B) 11.2 Ω 
C) 1.12 Ω 
D) 0.112 Ω 
E) 0.0112 Ω 
A) 112 Ω 
B) 11.2 Ω 
C) 1.12 Ω 
D) 0.112 Ω 
E) 0.0112 Ω

Question 6

When a potential difference is applied across a piece of wire made of metal A, a $5.0 - \mathrm { mA }$ current flows. If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire, how much current will flow through the metal-B wire? The lengths of both wires are the same, and the voltage difference remains unchanged. The resistivity of metal A is 1.68 × 10-8 ? ? m, and the resistivity of metal B is 1.59 × 10-8 ? ? m.

Accepted Answer

A) 21 mA 
B) 19 mA 
C) 11 mA 
D) 5.3 mA 
A) 21 mA 
B) 19 mA 
C) 11 mA 
D) 5.3 mA

Question 7

Consider two copper wires of equal length. One wire has twice the cross-sectional area of the other. How do the resistances of these two wires compare?

Accepted Answer

A) The thicker wire has twice the resistance of the thinner wire. 
B) The thicker wire has eight times the resistance of the thinner wire. 
C) The thicker wire has one-half the resistance of the thinner wire. 
D) The thicker wire has four times the resistance of the thinner wire. 
E) The thicker wire has one-fourth the resistance of the thinner wire. 
A) The thicker wire has twice the resistance of the thinner wire. 
B) The thicker wire has eight times the resistance of the thinner wire. 
C) The thicker wire has one-half the resistance of the thinner wire. 
D) The thicker wire has four times the resistance of the thinner wire. 
E) The thicker wire has one-fourth the resistance of the thinner wire.

Question 8

When the current through a resistor is increased by a factor of 4, the power dissipated by the resistor

Accepted Answer

A) decreases by a factor of 4. 
B) decreases by a factor of 16. 
C) increases by a factor of 16. 
D) increases by a factor of 4. 
E) increases by a factor of 2. 
A) decreases by a factor of 4. 
B) decreases by a factor of 16. 
C) increases by a factor of 16. 
D) increases by a factor of 4. 
E) increases by a factor of 2.

Question 9

If a quantity you calculated has units of $\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 3 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } }$ what is that quantity?

Accepted Answer

A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) current 
A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) current

Question 10

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced. If this battery supplies a current of 25 mA to the player, what is the cost of the energy provided by the battery in dollars per kWh?

Accepted Answer

A) $11/kWh 
B) $110/kWh 
C) $1100/kWh 
D) $11,000/kWh 
A) $11/kWh 
B) $110/kWh 
C) $1100/kWh 
D) $11,000/kWh

Question 11

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, a current of 2.0 amps flows through the wire. What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 ? ? m.

Accepted Answer

Question 12

What potential difference is required across an 8.0-? resistor to cause 2.0 A to flow through it?

Accepted Answer

The answer of What potential difference is required across an...

Question 13

A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?

Accepted Answer

A) 0.10 A 
B) 0.60 A 
C) 1.0 A 
D) 6.0 A 
A) 0.10 A 
B) 0.60 A 
C) 1.0 A 
D) 6.0 A

Question 14

A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?

Accepted Answer

A) 100 Ω 
B) 8.0 × 10-3 Ω 
C) 6.0 × 10-3 Ω 
D) 120 Ω 
E) 240 Ω 
A) 100 Ω 
B) 8.0 × 10-3 Ω 
C) 6.0 × 10-3 Ω 
D) 120 Ω 
E) 240 Ω

Question 15

A 25-W soldering iron runs on 110 V dc. What is its resistance?

Accepted Answer

A) 0.0020 Ω 
B) 4.4 Ω 
C) 0.48 kΩ 
D) 2.8 kΩ 
A) 0.0020 Ω 
B) 4.4 Ω 
C) 0.48 kΩ 
D) 2.8 kΩ

Question 16

A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?

Accepted Answer

A) 0.090 A 
B) 1.0 A 
C) 11 A 
D) 12 A 
A) 0.090 A 
B) 1.0 A 
C) 11 A 
D) 12 A

Question 17

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

Accepted Answer

A) current 
B) resistivity 
C) 1/(current) 
D) power 
E) 1/(resistivity) 
A) current 
B) resistivity 
C) 1/(current) 
D) power 
E) 1/(resistivity)

Question 18

A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference.
(a)What is the resistance of the wire?
(b)What is the resistivity of the material from which the wire is made?

Accepted Answer

(a)6.0 ? (

Question 19

A battery is rated at 12 V and 160 A-h. How much energy does this battery store?

Accepted Answer

A) 1.9 kJ 
B) 6.0 kJ 
C) 1.9 MJ 
D) 6.9 MJ 
A) 1.9 kJ 
B) 6.0 kJ 
C) 1.9 MJ 
D) 6.9 MJ

Question 20

When a 14.0-A current flows through an 8.00-Ω device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ∙ h?

Accepted Answer

A) $0.24 
B) $1.04 
C) $2.16 
D) $3.39 
A) $0.24 
B) $1.04 
C) $2.16 
D) $3.39

Exam 22: Current and Resistance

A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?

A light bulb operating at a dc voltage of 120 V has a power rating of 60 W. How much current is flowing through this bulb?

The resistivity of the material of a wire is 1.76 × 10-8 Ω ∙ m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance?

Consider two copper wires of equal length. One wire has twice the cross-sectional area of the other. How do the resistances of these two wires compare?

When the current through a resistor is increased by a factor of 4, the power dissipated by the resistor

If a quantity you calculated has units of kg⋅m3 s⋅C2\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 3 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } } s⋅C2kg⋅m3​ what is that quantity?

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced. If this battery supplies a current of 25 mA to the player, what is the cost of the energy provided by the battery in dollars per kWh?

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, a current of 2.0 amps flows through the wire. What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 ? ? m.

What potential difference is required across an 8.0-? resistor to cause 2.0 A to flow through it?

A charge of 12 C passes through an electroplating apparatus in 2.0 min. What is the average current in the apparatus?

A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?

A 25-W soldering iron runs on 110 V dc. What is its resistance?

A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?

For the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material?

A 25-m wire of diameter 0.30 mm draws 0.499 A when connected across a 3.0-V potential difference. (a)What is the resistance of the wire? (b)What is the resistivity of the material from which the wire is made?

A battery is rated at 12 V and 160 A-h. How much energy does this battery store?

When a 14.0-A current flows through an 8.00-Ω device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ∙ h?

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The resistivity of the material of a wire is 1.76 × 10^-8 Ω ∙ m. If the diameter of the wire is 2.00 mm and its length is 2.00 m, what is its resistance?

If a quantity you calculated has units of $\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 3 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } }$ what is that quantity?

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, a current of 2.0 amps flows through the wire. What is the diameter of this wire? The resistivity of copper is 1.72 × 10^-8? ? m.