A 0.2-m-long metal rod has a radius of 3 cm and a resistance of 3 × 10−5 Ω.What is the resistivity of the metal?

A) 1.4 × 10−8 Ω⋅m B) 42.4 × 10−8 Ω⋅m C) 1.3 × 10−8 Ω⋅m D) 2.1 × 10−8 Ω⋅m E) 14.1 × 10−8 Ω⋅m A) 1.4 × 10−8 Ω⋅m B) 42.4 × 10−8 Ω⋅m C) 1.3 × 10−8 Ω⋅m D) 2.1 × 10−8 Ω⋅m E) 14.1 × 10−8 Ω⋅m

Exam 17: Current and Resistance Electric Current

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The charge flowing through a light bulb attached to a 12-V battery in 14.0 s is 30.0 C.What is the average power supplied by the battery during this process?

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Question 61

A steam turbine at an electric power plant delivers 4,600 kW of power to an electrical generator which converts 85% of this mechanical energy into electrical energy.What is the current delivered by the generator if it delivers at 3,200 V?

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Question 62

The resistivity of a material is doubled when heated a certain amount.What happens to the resistance of a resistor made of this material when heated the same amount?

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Question 63

The temperature coefficient of resistivity for a "perfect" ohmic material would be:

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Question 64

The number density of conduction electrons in a metal can be found from the density ρ of the metal,the mass per mole M of the metal,the number of conduction electrons per metal atom,and Avogadro's number N_A.If we assume one conduction electron per atom,which of the following gives the number density of conduction electrons for a given metal?

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Question 65

A light bulb with a tungsten filament is attached to a source of variable voltage.As the voltage is increased on the bulb,

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Question 66

A 55-W light bulb is in a socket supplied with 100 V.What is the current in the bulb?

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Question 67

When an electric current exists within a conducting wire,which of the following statements describes the condition of any accompanying electric field?

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Question 68

A certain material is in a room at 27°C.If the absolute temperature (K)of the material is doubled,its resistance triples.(Water freezes at 273 K. )What is the value for α,the temperature coefficient of resistivity?

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Question 69

A superconducting wire's chief characteristic is which of the following?

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Question 70

A metal wire has a resistance of 26 Ω under room temperature conditions of 19°C.When the wire is heated to 79°C the resistance increases by 0.9 Ω.What is the temperature coefficient of resistivity of this metal?

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Question 71

A 0.2-m-long metal rod has a radius of 3 cm and a resistance of 3 × 10−⁵ Ω.What is the resistivity of the metal?

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Question 72

Ten coulombs of charge start from the negative terminal of a battery,flow through the battery and then leave the positive terminal through a wire,flow through a resistor and then return to the starting point on this closed circuit.In this complete process,the ten coulombs:

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Question 73

A wire 1 mm in diameter is connected to one end of a wire of the same material 2 mm in diameter of twice the length.A voltage source is connected to the wires and a current is passed through the wires.If it takes time T for the average conduction electron to traverse the 1-mm wire,how long does it take for such an electron to traverse the 2-mm wire?

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Question 74

If a lamp has a resistance of 105 Ω when it operates at 100 W,what current does it carry?

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Question 75

An electric toaster requires 900 W at 100 V.What is the resistance of the heating coil?

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Question 76

A wire carries a steady current of 0.1 A over a period of 15 s.What total charge passes through the wire in this time interval?

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Question 77

The charge flowing through a light bulb attached to a 11.0-V battery in 14.0 s is 25.0 C.What is the total energy delivered to the filament during this process?

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Question 78

A high-voltage transmission line carries 2,000 A at 1,400 kV for a distance of 300 miles.If the resistance in the wire is 1 Ω/mile,what is the power loss due to resistive losses?

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Question 79

A wire has resistance R.A second wire has twice the length,twice the diameter,and twice the resistivity of the first wire.What is its resistance?

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Question 80

Showing 61 - 80 of 83

Exam 17: Current and Resistance Electric Current

The charge flowing through a light bulb attached to a 12-V battery in 14.0 s is 30.0 C.What is the average power supplied by the battery during this process? ​

A steam turbine at an electric power plant delivers 4,600 kW of power to an electrical generator which converts 85% of this mechanical energy into electrical energy.What is the current delivered by the generator if it delivers at 3,200 V?

The resistivity of a material is doubled when heated a certain amount.What happens to the resistance of a resistor made of this material when heated the same amount?

The temperature coefficient of resistivity for a "perfect" ohmic material would be:

A light bulb with a tungsten filament is attached to a source of variable voltage.As the voltage is increased on the bulb,

A 55-W light bulb is in a socket supplied with 100 V.What is the current in the bulb?

When an electric current exists within a conducting wire,which of the following statements describes the condition of any accompanying electric field?

A certain material is in a room at 27°C.If the absolute temperature (K)of the material is doubled,its resistance triples.(Water freezes at 273 K. )What is the value for α,the temperature coefficient of resistivity?

A superconducting wire's chief characteristic is which of the following?

A metal wire has a resistance of 26 Ω under room temperature conditions of 19°C.When the wire is heated to 79°C the resistance increases by 0.9 Ω.What is the temperature coefficient of resistivity of this metal?

A 0.2-m-long metal rod has a radius of 3 cm and a resistance of 3 × 10−5 Ω.What is the resistivity of the metal?

Ten coulombs of charge start from the negative terminal of a battery,flow through the battery and then leave the positive terminal through a wire,flow through a resistor and then return to the starting point on this closed circuit.In this complete process,the ten coulombs:

If a lamp has a resistance of 105 Ω when it operates at 100 W,what current does it carry?

An electric toaster requires 900 W at 100 V.What is the resistance of the heating coil?

A wire carries a steady current of 0.1 A over a period of 15 s.What total charge passes through the wire in this time interval? ​

The charge flowing through a light bulb attached to a 11.0-V battery in 14.0 s is 25.0 C.What is the total energy delivered to the filament during this process?

A high-voltage transmission line carries 2,000 A at 1,400 kV for a distance of 300 miles.If the resistance in the wire is 1 Ω/mile,what is the power loss due to resistive losses? ​

A wire has resistance R.A second wire has twice the length,twice the diameter,and twice the resistivity of the first wire.What is its resistance?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

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The charge flowing through a light bulb attached to a 12-V battery in 14.0 s is 30.0 C.What is the average power supplied by the battery during this process?

A 0.2-m-long metal rod has a radius of 3 cm and a resistance of 3 × 10−⁵ Ω.What is the resistivity of the metal?

A wire carries a steady current of 0.1 A over a period of 15 s.What total charge passes through the wire in this time interval?

A high-voltage transmission line carries 2,000 A at 1,400 kV for a distance of 300 miles.If the resistance in the wire is 1 Ω/mile,what is the power loss due to resistive losses?