Carbon has a negative temperature coefficient of resistance of -0.5 × 10-3 (°C)−1.What temperature increase would result in a resistance decrease of 4% for a carbon resistor?

A) 8°C B) 80°C C) 19°C D) 13°C E) 400°C A) 8°C B) 80°C C) 19°C D) 13°C E) 400°C

An electric car is designed to run off a bank of 12-V batteries with total energy storage of 3.0 × 107 J.If the electric motor draws 5,400 W,what current will be delivered to the motor?

A) 450 A B) 225 A C) 675 A D) 338 A E) 113 A A) 450 A B) 225 A C) 675 A D) 338 A E) 113 A

A 24-Ω platinum wire at 25°C with a temperature coefficient of resistivity of 3.9 × 10−3 (°C)−1 will have what resistance at 95°C?

A) 17 Ω B) 19 Ω C) 31 Ω D) 24 Ω E) 7 Ω A) 17 Ω B) 19 Ω C) 31 Ω D) 24 Ω E) 7 Ω

A Nichrome wire has a radius of 0.9 mm and a resistivity of 1.5 × 10−6 Ω⋅m.What is the resistance per unit length of this wire?

A) 0.5 Ω/m B) 3.8 Ω/m C) 5.8 Ω/m D) 0.6 Ω/m E) 1.9 Ω/m A) 0.5 Ω/m B) 3.8 Ω/m C) 5.8 Ω/m D) 0.6 Ω/m E) 1.9 Ω/m

A solar panel measures 70 cm × 54 cm.In direct sunlight,the panel delivers 3.1 A at 12 V.If the intensity of sunlight is 1,000 W/m2,what is the efficiency of the solar panel in converting solar energy into electrical energy?

A) 20% B) 15% C) 10% D) 5% E) 8% A) 20% B) 15% C) 10% D) 5% E) 8%

Exam 17: Current and Resistance Electric Current

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A metal wire has a resistance of 15.50 Ω at a temperature of 25.0°C.If the same wire has a resistance of 15.9 Ω at 90.0°C,what is the resistance when its temperature is −32.0°C?

(Multiple Choice)

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Question 21

Carbon has a negative temperature coefficient of resistance of -0.5 × 10^-3 (°C)−¹.What temperature increase would result in a resistance decrease of 4% for a carbon resistor?

(Multiple Choice)

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(79)

Question 22

Wire A and Wire B are each carrying the same current.If the diameter of Wire A is twice that of Wire B,how does the drift velocity v_dA in Wire A compare to that in in Wire B?

(Multiple Choice)

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Question 23

Which is not a force?

(Multiple Choice)

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Question 24

The temperature coefficient of resistivity is a quantity that is:

(Multiple Choice)

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Question 25

The unit of electric current,the ampere,is equivalent to which of the following?

(Multiple Choice)

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Question 26

An 5.00-Ω resistor is dissipating 80 watts.What are the current through it and the difference of potential across it?

(Multiple Choice)

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Question 27

A flashlight bulb operating at a voltage of 3 V has a resistance of 10 Ω.How many electrons pass through the bulb filament per second (e = 1.6 × 10−¹⁹ C)?

(Multiple Choice)

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(82)

Question 28

An electric car is designed to run off a bank of 12-V batteries with total energy storage of 3.0 × 10⁷ J.If the electric motor draws 5,400 W,what current will be delivered to the motor?

(Multiple Choice)

4.9/5

(85)

Question 29

A 24-Ω platinum wire at 25°C with a temperature coefficient of resistivity of 3.9 × 10−³ (°C)−¹ will have what resistance at 95°C?

(Multiple Choice)

4.8/5

(74)

Question 30

If electrical energy costs 4 cents per kWh,what does it cost to heat 210 kg water from 30°C to 65°C? (The specific heat of water = 10³ cal/kg⋅°C and 1.0 cal = 4.186 J. )

(Multiple Choice)

4.7/5

(79)

Question 31

A Nichrome wire has a radius of 0.9 mm and a resistivity of 1.5 × 10−⁶ Ω⋅m.What is the resistance per unit length of this wire?

(Multiple Choice)

4.8/5

(73)

Question 32

If a 12-V battery,with negligible internal resistance,and an 20-Ω resistor are connected in series,what is the amount of electrical energy transformed to heat per coulomb of charge that flows through the circuit?

(Multiple Choice)

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(83)

Question 33

A 400-W heater carries a current of 4.0 A.How much does it cost to operate the heater for 50 min if electrical energy costs 6 cents per kWh?

(Multiple Choice)

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(64)

Question 34

A water pump draws about 3.7 A when connected to 200 V.What is the cost (with electrical energy at 9 cents per kWh)of running the pump for 12 h?

(Multiple Choice)

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(85)

Question 35

A solar panel measures 70 cm × 54 cm.In direct sunlight,the panel delivers 3.1 A at 12 V.If the intensity of sunlight is 1,000 W/m²,what is the efficiency of the solar panel in converting solar energy into electrical energy?

(Multiple Choice)

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Question 36

When you flip a switch to turn on a light,the delay before the light turns on is determined by:

(Multiple Choice)

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Question 37

When current is flowing in a superconductor,which statement is not true?

(Multiple Choice)

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Question 38

Materials having resistance changes as voltage or current varies are called:

(Multiple Choice)

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Question 39

Replacing a wire resistor with another of the same material and length but with three times the diameter will have the effect of changing the resistance by what factor?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 83

Exam 17: Current and Resistance Electric Current

A metal wire has a resistance of 15.50 Ω at a temperature of 25.0°C.If the same wire has a resistance of 15.9 Ω at 90.0°C,what is the resistance when its temperature is −32.0°C?

Carbon has a negative temperature coefficient of resistance of -0.5 × 10-3 (°C)−1.What temperature increase would result in a resistance decrease of 4% for a carbon resistor?

Wire A and Wire B are each carrying the same current.If the diameter of Wire A is twice that of Wire B,how does the drift velocity vdA in Wire A compare to that in in Wire B?

Which is not a force?

The temperature coefficient of resistivity is a quantity that is:

The unit of electric current,the ampere,is equivalent to which of the following?

An 5.00-Ω resistor is dissipating 80 watts.What are the current through it and the difference of potential across it? ​

A flashlight bulb operating at a voltage of 3 V has a resistance of 10 Ω.How many electrons pass through the bulb filament per second (e = 1.6 × 10−19 C)?

An electric car is designed to run off a bank of 12-V batteries with total energy storage of 3.0 × 107 J.If the electric motor draws 5,400 W,what current will be delivered to the motor? ​

A 24-Ω platinum wire at 25°C with a temperature coefficient of resistivity of 3.9 × 10−3 (°C)−1 will have what resistance at 95°C?

If electrical energy costs 4 cents per kWh,what does it cost to heat 210 kg water from 30°C to 65°C? (The specific heat of water = 103 cal/kg⋅°C and 1.0 cal = 4.186 J. )

A Nichrome wire has a radius of 0.9 mm and a resistivity of 1.5 × 10−6 Ω⋅m.What is the resistance per unit length of this wire?

If a 12-V battery,with negligible internal resistance,and an 20-Ω resistor are connected in series,what is the amount of electrical energy transformed to heat per coulomb of charge that flows through the circuit?

A 400-W heater carries a current of 4.0 A.How much does it cost to operate the heater for 50 min if electrical energy costs 6 cents per kWh?

A water pump draws about 3.7 A when connected to 200 V.What is the cost (with electrical energy at 9 cents per kWh)of running the pump for 12 h?

A solar panel measures 70 cm × 54 cm.In direct sunlight,the panel delivers 3.1 A at 12 V.If the intensity of sunlight is 1,000 W/m2,what is the efficiency of the solar panel in converting solar energy into electrical energy? ​

When you flip a switch to turn on a light,the delay before the light turns on is determined by:

When current is flowing in a superconductor,which statement is not true?

Materials having resistance changes as voltage or current varies are called:

Replacing a wire resistor with another of the same material and length but with three times the diameter will have the effect of changing the resistance by what factor?

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

Carbon has a negative temperature coefficient of resistance of -0.5 × 10^-3 (°C)−¹.What temperature increase would result in a resistance decrease of 4% for a carbon resistor?

Wire A and Wire B are each carrying the same current.If the diameter of Wire A is twice that of Wire B,how does the drift velocity v_dA in Wire A compare to that in in Wire B?

An 5.00-Ω resistor is dissipating 80 watts.What are the current through it and the difference of potential across it?

A flashlight bulb operating at a voltage of 3 V has a resistance of 10 Ω.How many electrons pass through the bulb filament per second (e = 1.6 × 10−¹⁹ C)?

An electric car is designed to run off a bank of 12-V batteries with total energy storage of 3.0 × 10⁷ J.If the electric motor draws 5,400 W,what current will be delivered to the motor?

A 24-Ω platinum wire at 25°C with a temperature coefficient of resistivity of 3.9 × 10−³ (°C)−¹ will have what resistance at 95°C?

If electrical energy costs 4 cents per kWh,what does it cost to heat 210 kg water from 30°C to 65°C? (The specific heat of water = 10³ cal/kg⋅°C and 1.0 cal = 4.186 J. )

A Nichrome wire has a radius of 0.9 mm and a resistivity of 1.5 × 10−⁶ Ω⋅m.What is the resistance per unit length of this wire?

A solar panel measures 70 cm × 54 cm.In direct sunlight,the panel delivers 3.1 A at 12 V.If the intensity of sunlight is 1,000 W/m²,what is the efficiency of the solar panel in converting solar energy into electrical energy?