Question 1

Raising the current through a resistor from 8.50 A to 11.3 A increases the power by

Accepted Answer

A)  33.0%. 
B)  77.0%. 
C)  113%. 
D)  157%. 
E)  0% (no change). 
A)  33.0%. 
B)  77.0%. 
C)  113%. 
D)  157%. 
E)  0% (no change).

Question 2

Capacitors of values 6.00 mF and 9.00 mF are connected in series to a 30.0 V power supply.What is the resulting charge on the 6.00 mF capacitor?

Accepted Answer

A)  180 mC 
B)  270 mC 
C)  90.0 mC 
D)  108 mC 
E)  200 mC 
A)  180 mC 
B)  270 mC 
C)  90.0 mC 
D)  108 mC 
E)  200 mC

Question 3

A 2.50 A current is carried by a copper wire of radius 1.0 mm.If the density of conduction electrons is 8.0 $\times$ 1028/m3,what is the drift velocity of the conduction electrons?

Accepted Answer

A)  3.0 $\times$ 108 m/s 
B)  3.2 $\times$ 10 4 m/s 
C)  1.6 $\times$ 10 5 m/s 
D)  6.2 $\times$ 10 4 m/s 
E)  6.2 $\times$ 10 5 m/s 
A)  3.0 $\times$ 108 m/s 
B)  3.2 $\times$ 10 4 m/s 
C)  1.6 $\times$ 10 5 m/s 
D)  6.2 $\times$ 10 4 m/s 
E)  6.2 $\times$ 10 5 m/s

Question 4

One hundred meters of a certain type of wire has a resistance of 7.2 $\Omega$.What is the resistance of 2.5 m of this wire?

Accepted Answer

A)  18 $\Omega$ 
B)  1.8 $\Omega$ 
C)  0.18 $\Omega$ 
D)  3.0 $\Omega$ 
E)  0.30 $\Omega$ 
A)  18 $\Omega$ 
B)  1.8 $\Omega$ 
C)  0.18 $\Omega$ 
D)  3.0 $\Omega$ 
E)  0.30 $\Omega$

Question 5

Silver contains 5.8 $\times$ 1028 conduction electrons per m3.How many conduction electrons are in a 1.0 m length of silver wire of diameter 2.6 mm?

Accepted Answer

A)  1.9 $\times$ 105 
B)  4.7 $\times$ 104 
C)  3.1 $\times$ 1023 
D)  1.2 $\times$ 1024 
E)  6.0 $\times$ 1023 
A)  1.9 $\times$ 105 
B)  4.7 $\times$ 104 
C)  3.1 $\times$ 1023 
D)  1.2 $\times$ 1024 
E)  6.0 $\times$ 1023

Question 6

A 12.0 V battery is placed across a 4.00 $\Omega$ resistor.If the current through the resistor is 2.80 A,what is the internal resistance of the battery?

Accepted Answer

A)  0.200 $\Omega$ 
B)  0.290 $\Omega$ 
C)  4.29 $\Omega$ 
D)  3.71 $\Omega$ 
E)  0.800 $\Omega$ 
A)  0.200 $\Omega$ 
B)  0.290 $\Omega$ 
C)  4.29 $\Omega$ 
D)  3.71 $\Omega$ 
E)  0.800 $\Omega$

Question 7

If 64 coulombs flow along a wire in 4.0 seconds,what is the average current?

Accepted Answer

A)  64 A 
B)  32 A 
C)  16 A 
D)  4.0 A 
E)  none of these choices are correct 
A)  64 A 
B)  32 A 
C)  16 A 
D)  4.0 A 
E)  none of these choices are correct

Question 8

A length L0 of wire has a resistance of 32.0 $\Omega$.The wire is uniformly stretched to four times its original length,i.e.,4 L0.If a length L0 is now cut from the stretched wire,what is its resistance?

Accepted Answer

A)  512 $\Omega$ 
B)  128 $\Omega$ 
C)  32.0 $\Omega$ 
D)  8.00 $\Omega$ 
E)  2.00 $\Omega$ 
A)  512 $\Omega$ 
B)  128 $\Omega$ 
C)  32.0 $\Omega$ 
D)  8.00 $\Omega$ 
E)  2.00 $\Omega$

Question 9

A capacitor is connected in series with a resistor and a switch.With the switch open,the capacitor is charged to 9.0 V.When the switch is closed,how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of the circuit is 4.0 s?

Accepted Answer

A)  0.3 s 
B)  1.2 s 
C)  1.6 s 
D)  2.7 s 
E)  12 s 
A)  0.3 s 
B)  1.2 s 
C)  1.6 s 
D)  2.7 s 
E)  12 s

Question 10

A three-cell flashlight has 3 batteries in series each with an emf of 1.5 V.If the bulb has a resistance of 50 $\Omega$,what current is flowing when the flashlight is operating? (Assume the internal resistance of the batteries is negligible.)

Accepted Answer

A)  30 mA 
B)  10 mA 
C)  27 mA 
D)  90 mA 
E)  11 A 
A)  30 mA 
B)  10 mA 
C)  27 mA 
D)  90 mA 
E)  11 A

Raising the current through a resistor from 8.50 A to 11.3 A increases the power by

Capacitors of values 6.00 mF and 9.00 mF are connected in series to a 30.0 V power supply.What is the resulting charge on the 6.00 mF capacitor?

A 2.50 A current is carried by a copper wire of radius 1.0 mm.If the density of conduction electrons is 8.0 $\times$ 10²⁸/m³,what is the drift velocity of the conduction electrons?

One hundred meters of a certain type of wire has a resistance of 7.2 $\Omega$ .What is the resistance of 2.5 m of this wire?

Silver contains 5.8 $\times$ 10²⁸ conduction electrons per m³.How many conduction electrons are in a 1.0 m length of silver wire of diameter 2.6 mm?

A 12.0 V battery is placed across a 4.00 $\Omega$ resistor.If the current through the resistor is 2.80 A,what is the internal resistance of the battery?

If 64 coulombs flow along a wire in 4.0 seconds,what is the average current?

A length L₀ of wire has a resistance of 32.0 $\Omega$ .The wire is uniformly stretched to four times its original length,i.e.,4 L₀.If a length L₀ is now cut from the stretched wire,what is its resistance?

A capacitor is connected in series with a resistor and a switch.With the switch open,the capacitor is charged to 9.0 V.When the switch is closed,how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of the circuit is 4.0 s?

A three-cell flashlight has 3 batteries in series each with an emf of 1.5 V.If the bulb has a resistance of 50 $\Omega$ ,what current is flowing when the flashlight is operating? (Assume the internal resistance of the batteries is negligible.)

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

Exam 18: Electric Current and Circuits

Raising the current through a resistor from 8.50 A to 11.3 A increases the power by

Capacitors of values 6.00 mF and 9.00 mF are connected in series to a 30.0 V power supply.What is the resulting charge on the 6.00 mF capacitor?

A 2.50 A current is carried by a copper wire of radius 1.0 mm.If the density of conduction electrons is 8.0 ×\times× 1028/m3,what is the drift velocity of the conduction electrons?

One hundred meters of a certain type of wire has a resistance of 7.2 Ω\OmegaΩ .What is the resistance of 2.5 m of this wire?

Silver contains 5.8 ×\times× 1028 conduction electrons per m3.How many conduction electrons are in a 1.0 m length of silver wire of diameter 2.6 mm?

A 12.0 V battery is placed across a 4.00 Ω\OmegaΩ resistor.If the current through the resistor is 2.80 A,what is the internal resistance of the battery?

If 64 coulombs flow along a wire in 4.0 seconds,what is the average current?

A length L0 of wire has a resistance of 32.0 Ω\OmegaΩ .The wire is uniformly stretched to four times its original length,i.e.,4 L0.If a length L0 is now cut from the stretched wire,what is its resistance?

A capacitor is connected in series with a resistor and a switch.With the switch open,the capacitor is charged to 9.0 V.When the switch is closed,how long will it take for the voltage across the capacitor to drop to 6.0 V if the time constant of the circuit is 4.0 s?

A three-cell flashlight has 3 batteries in series each with an emf of 1.5 V.If the bulb has a resistance of 50 Ω\OmegaΩ ,what current is flowing when the flashlight is operating? (Assume the internal resistance of the batteries is negligible.)

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

A 2.50 A current is carried by a copper wire of radius 1.0 mm.If the density of conduction electrons is 8.0 $\times$ 10²⁸/m³,what is the drift velocity of the conduction electrons?

One hundred meters of a certain type of wire has a resistance of 7.2 $\Omega$ .What is the resistance of 2.5 m of this wire?

Silver contains 5.8 $\times$ 10²⁸ conduction electrons per m³.How many conduction electrons are in a 1.0 m length of silver wire of diameter 2.6 mm?

A 12.0 V battery is placed across a 4.00 $\Omega$ resistor.If the current through the resistor is 2.80 A,what is the internal resistance of the battery?

A length L₀ of wire has a resistance of 32.0 $\Omega$ .The wire is uniformly stretched to four times its original length,i.e.,4 L₀.If a length L₀ is now cut from the stretched wire,what is its resistance?

A three-cell flashlight has 3 batteries in series each with an emf of 1.5 V.If the bulb has a resistance of 50 $\Omega$ ,what current is flowing when the flashlight is operating? (Assume the internal resistance of the batteries is negligible.)