A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 × 10-8 Ω ∙ m.How long would it have to be to have a resistance of 1.0 Ω?

A) 5.9 × 106 m B) 5.9 m C) 5.9 × 104 m D) 590 m E) 5.9 km A) 5.9 × 106 m B) 5.9 m C) 5.9 × 104 m D) 590 m E) 5.9 km

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I1 if the batteries are ideal.(It is not necessary to solve the entire circuit. )

A) 0 A B) +0.2 A C) +0.4 A D) -0.2 A E) -0.4 A A) 0 A B) +0.2 A C) +0.4 A D) -0.2 A E) -0.4 A

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I2 if the batteries are ideal.(It is not necessary to solve the entire circuit. )

A) +0.1 A B) +0.3 A C) +0.5 A D) -0.1 A E) -0.3 A A) +0.1 A B) +0.3 A C) +0.5 A D) -0.1 A E) -0.3 A

Exam 21: Electric Current and Direct-Current Circuits

A certain metal wire has a cross-sectional area of 1.0 cm² and a resistivity of 1.7 × 10^-8 Ω ∙ m.How long would it have to be to have a resistance of 1.0 Ω?

(Multiple Choice)

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Question 141

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 142

During a period of high power demand,the voltage output of the power company is reduced by 5.0%.By what percentage is the power in a resistor decreased?

(Multiple Choice)

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Question 143

For the circuit shown in the figure,V = 60 V,C = 20 µF,R = 0.10 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the charge on the capacitor 8.0 s after closing the switch?

(Multiple Choice)

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Question 144

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 145

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I₁ if the batteries are ideal.(It is not necessary to solve the entire circuit. )

(Multiple Choice)

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Question 146

If 3.0 × 10¹⁵ electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s,what is the current in the wire? (e = 1.60 × 10^-19C)

(Multiple Choice)

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Question 147

If a quantity you calculated has units of ,what is that quantity?

(Multiple Choice)

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Question 148

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

(Multiple Choice)

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Question 149

What is the magnitude of the potential difference between points B and C for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

(Multiple Choice)

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Question 150

A 5.0-V battery storing 43.0 kJ of energy supplies 1.5 A. Of current to a circuit.How much energy does the battery have left after powering the circuit for 1.0 h?

(Multiple Choice)

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Question 151

How much current will flow through a 40.0mm. Length of metal wire with a radius of 0.0mm. If it is connected to a power source supplying 16.0V? The resistivity of the metal is 1.68 × 10^-8 Ω ∙ m.

(Multiple Choice)

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Question 152

A fully charged 37-µF capacitor is discharged through a 1.0-kΩ resistor.If the voltage across the capacitor is reduced to 7.6 volts after just 20 ms,what was the original potential across the capacitor?

(Multiple Choice)

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Question 153

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I₂ if the batteries are ideal.(It is not necessary to solve the entire circuit. )

(Multiple Choice)

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Question 154

Each of the resistors shown in the figure has a resistance of What is the equivalent resistance between points a and b of this combination?

(Multiple Choice)

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Question 155

A toaster is rated at 800 W when operating at 120 V dc.What is the resistance of its heating element?

(Multiple Choice)

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Question 156

Copper wire #1 has a length L and a radius b.Copper wire #2 has a length 2L and a radius 2b.Which statement about the resistance across the ends of the wires is true?

(Multiple Choice)

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Question 157

Four resistors are connected across an ideal dc battery with voltage V as shown in the figure.Assume that all quantities shown are accurate to two significant figures.If the total current through this circuit is I = 2.0 A,what is the current through the 4.0-Ω resistor?

(Multiple Choice)

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Question 158

A total of 2.0 × 10¹³ electrons pass a given point in a wire in 15 s.What is the current in the wire? (e = 1.60 × 10^-19C)

(Multiple Choice)

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Question 159

A 2.0-μF capacitor is charged to 12 V and then discharged through a 4.0-MΩ resistor.How long will it take for the voltage across the capacitor to drop to 3.0 V?

(Multiple Choice)

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Question 160

Showing 141 - 160 of 228

Exam 21: Electric Current and Direct-Current Circuits

A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 × 10-8 Ω ∙ m.How long would it have to be to have a resistance of 1.0 Ω?

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

During a period of high power demand,the voltage output of the power company is reduced by 5.0%.By what percentage is the power in a resistor decreased?

For the circuit shown in the figure,V = 60 V,C = 20 µF,R = 0.10 MΩ,and the battery is ideal.Initially the switch S is open and the capacitor is uncharged.The switch is then closed at time t = 0.00 s.What is the charge on the capacitor 8.0 s after closing the switch?

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)

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I1 if the batteries are ideal.(It is not necessary to solve the entire circuit. )

If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s,what is the current in the wire? (e = 1.60 × 10-19 C)

If a quantity you calculated has units of ,what is that quantity?

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

What is the magnitude of the potential difference between points B and C for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

A 5.0-V battery storing 43.0 kJ of energy supplies 1.5 A. Of current to a circuit.How much energy does the battery have left after powering the circuit for 1.0 h?

How much current will flow through a 40.0mm. Length of metal wire with a radius of 0.0mm. If it is connected to a power source supplying 16.0V? The resistivity of the metal is 1.68 × 10-8 Ω ∙ m.

A fully charged 37-µF capacitor is discharged through a 1.0-kΩ resistor.If the voltage across the capacitor is reduced to 7.6 volts after just 20 ms,what was the original potential across the capacitor?

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I2 if the batteries are ideal.(It is not necessary to solve the entire circuit. )

Each of the resistors shown in the figure has a resistance of What is the equivalent resistance between points a and b of this combination?

A toaster is rated at 800 W when operating at 120 V dc.What is the resistance of its heating element?

Copper wire #1 has a length L and a radius b.Copper wire #2 has a length 2L and a radius 2b.Which statement about the resistance across the ends of the wires is true?

Four resistors are connected across an ideal dc battery with voltage V as shown in the figure.Assume that all quantities shown are accurate to two significant figures.If the total current through this circuit is I = 2.0 A,what is the current through the 4.0-Ω resistor?

A total of 2.0 × 1013 electrons pass a given point in a wire in 15 s.What is the current in the wire? (e = 1.60 × 10-19 C)

A 2.0-μF capacitor is charged to 12 V and then discharged through a 4.0-MΩ resistor.How long will it take for the voltage across the capacitor to drop to 3.0 V?

Introduction to Physics

One-Dimensional Kinematics

Vectors in Physics

Two-Dimensional Kinematics

Newtons Laws of Motion

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Work and Kinetic Energy

Potential Energy and Conservation of Energy

Linear Momentum and Collisions

Rotational Kinematics and Energy

Rotational Dynamics and Static Equilibrium

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Oscillations About Equilibrium

Waves and Sound

Fluids

Temperature and Heat

Phases and Phase Changes

The Laws of Thermodynamics

Electric Charges, Forces, and Fields

Electric Potential and Electric

Magnetism

Magnetic Flux and Faradays Law of Induction

Alternating-Current Circuits

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Physical Optics: Interference and Diffraction

Relativity

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A certain metal wire has a cross-sectional area of 1.0 cm² and a resistivity of 1.7 × 10^-8 Ω ∙ m.How long would it have to be to have a resistance of 1.0 Ω?

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)

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I₁ if the batteries are ideal.(It is not necessary to solve the entire circuit. )

If 3.0 × 10¹⁵ electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s,what is the current in the wire? (e = 1.60 × 10^-19C)

How much current will flow through a 40.0mm. Length of metal wire with a radius of 0.0mm. If it is connected to a power source supplying 16.0V? The resistivity of the metal is 1.68 × 10^-8 Ω ∙ m.

A multiloop circuit is shown in the figure,but some quantities are not labeled.Find the current I₂ if the batteries are ideal.(It is not necessary to solve the entire circuit. )

A total of 2.0 × 10¹³ electrons pass a given point in a wire in 15 s.What is the current in the wire? (e = 1.60 × 10^-19C)