The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 Ω ∙ m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?

A) 17 mV B) 0.90 mV C) 1.7 mV D) 10 mV E) 90 mV A) 17 mV B) 0.90 mV C) 1.7 mV D) 10 mV E) 90 mV

Exam 22: Current and Resistance

A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10^-19C)

(Multiple Choice)

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Question 101

If we double the resistance in a circuit but keep the current in it constant, the power dissipated by that circuit will

(Multiple Choice)

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Question 102

A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?

(Multiple Choice)

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Question 103

When a current flows through an ionic liquid such as salty water, the moving charges are

(Multiple Choice)

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Question 104

The resistivity of a 1.0 m long copper wire is 1.72 × 10^-8 Ω ∙ m and its cross sectional area is 2.0 × 10^-6 m². If the wire carries a current of 0.20 A, what is the voltage across the wire?

(Multiple Choice)

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Question 105

The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?

(Short Answer)

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Question 106

A simple circuit has a total resistance of 30 Ω. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?

(Multiple Choice)

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Question 107

The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?

(Multiple Choice)

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Question 108

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

(Multiple Choice)

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Question 109

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

(Multiple Choice)

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Question 110

A 200-Ω resistor is rated at 1/4 W. What is the maximum current it can safely draw?

(Multiple Choice)

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Question 111

When a 1.0-m length of metal wire is connected to a $1.5 - V$ battery, a current of 8.0 ${~mA}$ flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10^-8 Ω ∙ m.

(Multiple Choice)

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Question 112

When a current flows through a metal wire, the moving charges are

(Multiple Choice)

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Question 113

A certain metal has a resistivity of 1.68 × 10^-8 Ω ∙ m. You have a long spool of wire made from this metal. If this wire has a diameter of 0.15 mm, how long should you cut a segment so its resistance will be 15 Ω?

(Multiple Choice)

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Question 114

When 5.00 A is flowing through an 10.0-Ω device, how much power is being dissipated in the device?

(Multiple Choice)

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Question 115

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

(Multiple Choice)

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Question 116

A resistor operated at 120 V dc is rated at 1.40 kW. (a) What is the normal operating current through the resistor? (b) What is the resistance of the resistor?

(Short Answer)

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Question 117

The resistivity of gold is $2.44 \times 10 ^{- 8} \Omega \cdot \mathrm { m }$ at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 mA. What power is dissipated in this wire at 20°C?

(Multiple Choice)

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Question 118

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

(Multiple Choice)

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Question 119

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure

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Question 120

Showing 101 - 120 of 125

Exam 22: Current and Resistance

A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)

If we double the resistance in a circuit but keep the current in it constant, the power dissipated by that circuit will

A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?

When a current flows through an ionic liquid such as salty water, the moving charges are

The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 Ω ∙ m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?

The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?

A simple circuit has a total resistance of 30 Ω. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?

The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?

If a quantity you calculated has units of kg⋅m2 s2⋅C\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 2 } } { \mathrm {~s} ^ { 2 } \cdot \mathrm { C } } s2⋅Ckg⋅m2​ , what is that quantity?

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

A 200-Ω resistor is rated at 1/4 W. What is the maximum current it can safely draw?

When a 1.0-m length of metal wire is connected to a 1.5−V1.5 - V1.5−V battery, a current of 8.0 mA{~mA} mA flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 Ω ∙ m.

When a current flows through a metal wire, the moving charges are

A certain metal has a resistivity of 1.68 × 10-8 Ω ∙ m. You have a long spool of wire made from this metal. If this wire has a diameter of 0.15 mm, how long should you cut a segment so its resistance will be 15 Ω?

When 5.00 A is flowing through an 10.0-Ω device, how much power is being dissipated in the device?

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

A resistor operated at 120 V dc is rated at 1.40 kW. (a) What is the normal operating current through the resistor? (b) What is the resistance of the resistor?

The resistivity of gold is 2.44×10−8Ω⋅m2.44 \times 10 ^{- 8} \Omega \cdot \mathrm { m }2.44×10−8Ω⋅m at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 mA. What power is dissipated in this wire at 20°C?

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

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure

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A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10^-19C)

The resistivity of a 1.0 m long copper wire is 1.72 × 10^-8 Ω ∙ m and its cross sectional area is 2.0 × 10^-6 m². If the wire carries a current of 0.20 A, what is the voltage across the wire?

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

When a 1.0-m length of metal wire is connected to a $1.5 - V$ battery, a current of 8.0 ${~mA}$ flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10^-8 Ω ∙ m.

A certain metal has a resistivity of 1.68 × 10^-8 Ω ∙ m. You have a long spool of wire made from this metal. If this wire has a diameter of 0.15 mm, how long should you cut a segment so its resistance will be 15 Ω?

The resistivity of gold is $2.44 \times 10 ^{- 8} \Omega \cdot \mathrm { m }$ at a temperature of 20°C. A gold wire, 1.8 mm in diameter and 14 cm long, carries a current of 480 mA. What power is dissipated in this wire at 20°C?