Question 1

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

Accepted Answer

A)  -2 A
B)  2 A
C)  6 A
D)  -5 A
E)  0 A A

Question 2

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

Accepted Answer

A)  0.023 Ω ∙ m
B)  0.015 Ω ∙ m
C)  1.5 × 10-4 Ω ∙ m
D)  2.3 × 10-6 Ω ∙ m D

Question 3

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V as shown in the figure.If the total current through the circuit is I = 2.0 A,what is the applied voltage V?

Accepted Answer

A)  6.0 V
B)  3.0 V
C)  2.0 V
D)  2.7 V
E)  1.5 V D

Question 4

A 3.0-Ω resistor is connected in parallel with a 6.0-Ω resistor.This combination is then connected in series with a 4.0-Ω resistor.The resistors are connected across an ideal 12-volt battery.How much power is dissipated in the 3.0-Ω resistor?

Accepted Answer

A)  2.7 W
B)  5.3 W
C)  6.0 W
D)  12 W

Question 5

When there is electric current through a metal wire,the moving charges are

Accepted Answer

A)  only protons.
B)  only electrons.
C)  both protons and electrons.
D)  positive metal ions.
E)  negative metal ions.

Question 6

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

Accepted Answer

A)  increases.
B)  decreases.
C)  does not change.
D)  increases for a time and then starts to decrease.

Question 7

If a charge of 11.4 C passes through a computer in 1.75 min,what is the average current through the computer?

Accepted Answer

The answer of If a charge of 11.4 C passes...

Question 8

A 100-W driveway light bulb is on 10 hours per day.If the power company charges 10¢ for each kilowatt-hour of electric energy used,estimate the yearly cost to operate the bulb if it is used every day for a 365-day year.

Accepted Answer

A)  $3.65
B)  $7.30
C)  $37
D)  $73

Question 9

For the circuit shown in the figure,write the Kirchhoff current equation for the node labeled A.Notice the directions of the currents!

Accepted Answer

The answer of For the circuit shown in the figure,write...

Question 10

A 4.0-Ω resistor is connected with a 12-Ω resistor and this combination is connected across an ideal dc power supply with V = 6.0 V,as shown in the figure.When there is a total current I through the power supply,what is the current through the 12-Ω resistor?

Accepted Answer

A)  1.5 A
B)  2.0 A
C)  2.5 A
D)  3.0 A
E)  0.50 A

Question 11

A certain 20-A circuit breaker trips when the current in it equals 20 A.What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker?

Accepted Answer

A)  11
B)  17
C)  23
D)  27

Question 12

What is the current through a $40.0 - \mathrm { m }$ length of metal wire with a radius of $0.0 \mathrm {~mm}$ when it is connected to a $16.0 \mathrm {~V} \text { ? }$  power source? The resistivity of the metal is 1.68 × 10-8 Ω ∙ m.

Accepted Answer

A)  0 A
B)  0 x 108 A
C)  0 nA

Question 13

If V = 20 V and the battery is ideal,what is the current through R3 in the figure?

Accepted Answer

A)  0.050 A
B)  0.20 A
C)  1.0 A
D)  4.0 A

Question 14

A 7.0-Ω resistor is connected across the terminals of a battery having an internal emf of 10 V.If there is a 0.50-A current through the circuit,what is the internal resistance of the battery?

Accepted Answer

A)  13 Ω
B)  20 Ω
C)  10.8 Ω
D)  27.0 Ω

Question 15

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference,the current through the wire is 2.0 amps.What is the diameter of this wire? The resistivity of copper is 1.72 × 10^-8Ω ∙ m.

Accepted Answer

The answer of When a thin copper wire that is...

Question 16

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced.If this battery supplies a current of 25 mA to the player,what is the cost of the energy provided by the battery in dollars per kWh?

Accepted Answer

A)  $11/kWh
B)  $110/kWh
C)  $1100/kWh
D)  $11,000/kWh

Question 17

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

Accepted Answer

A)  6.0 V
B)  4.0 V
C)  3.0 V
D)  2.0 V

Question 18

A multiloop circuit is shown in the figure.Find the emf ε1 if the batteries are ideal.(It is not necessary to solve the entire circuit.)

Accepted Answer

A)  -4 V
B)  4 V
C)  44 V
D)  52 V
E)  -52 V

Question 19

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

Accepted Answer

A)  1.5 kJ
B)  3.0 kJ
C)  0.18 MJ
D)  11 MJ

Question 20

Three resistors of 12 Ω,12 Ω,and 6.0 Ω are connected together,and an ideal 12-V battery is connected across the combination.What is the current through the battery if they are connected (a)in series or (b)in parallel?

Accepted Answer

The answer of Three resistors of 12 Ω,12 Ω,and 6.0...

Exam 17: Dc Circuits

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

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V as shown in the figure.If the total current through the circuit is I = 2.0 A,what is the applied voltage V?

A 3.0-Ω resistor is connected in parallel with a 6.0-Ω resistor.This combination is then connected in series with a 4.0-Ω resistor.The resistors are connected across an ideal 12-volt battery.How much power is dissipated in the 3.0-Ω resistor?

When there is electric current through a metal wire,the moving charges are

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

If a charge of 11.4 C passes through a computer in 1.75 min,what is the average current through the computer?

A 100-W driveway light bulb is on 10 hours per day.If the power company charges 10¢ for each kilowatt-hour of electric energy used,estimate the yearly cost to operate the bulb if it is used every day for a 365-day year.

For the circuit shown in the figure,write the Kirchhoff current equation for the node labeled A.Notice the directions of the currents!

A 4.0-Ω resistor is connected with a 12-Ω resistor and this combination is connected across an ideal dc power supply with V = 6.0 V,as shown in the figure.When there is a total current I through the power supply,what is the current through the 12-Ω resistor?

A certain 20-A circuit breaker trips when the current in it equals 20 A.What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker?

What is the current through a $40.0 - \mathrm { m }$ length of metal wire with a radius of $0.0 \mathrm {~mm}$ when it is connected to a $16.0 \mathrm {~V} \text { ? }$ power source? The resistivity of the metal is 1.68 × 10^-8 Ω ∙ m.

If V = 20 V and the battery is ideal,what is the current through R₃ in the figure?

A 7.0-Ω resistor is connected across the terminals of a battery having an internal emf of 10 V.If there is a 0.50-A current through the circuit,what is the internal resistance of the battery?

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference,the current through the wire is 2.0 amps.What is the diameter of this wire? The resistivity of copper is 1.72 × 10^-8Ω ∙ m.

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced.If this battery supplies a current of 25 mA to the player,what is the cost of the energy provided by the battery in dollars per kWh?

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

A multiloop circuit is shown in the figure.Find the emf ε₁ if the batteries are ideal.(It is not necessary to solve the entire circuit.)

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

Three resistors of 12 Ω,12 Ω,and 6.0 Ω are connected together,and an ideal 12-V battery is connected across the combination.What is the current through the battery if they are connected (a)in series or (b)in parallel?

Exam 17: Dc Circuits

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

A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side.An ohmmeter measures 0.040 Ω across its ends.What is the resistivity of the material from which this rod is made?

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V as shown in the figure.If the total current through the circuit is I = 2.0 A,what is the applied voltage V?

A 3.0-Ω resistor is connected in parallel with a 6.0-Ω resistor.This combination is then connected in series with a 4.0-Ω resistor.The resistors are connected across an ideal 12-volt battery.How much power is dissipated in the 3.0-Ω resistor?

When there is electric current through a metal wire,the moving charges are

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

If a charge of 11.4 C passes through a computer in 1.75 min,what is the average current through the computer?

A 100-W driveway light bulb is on 10 hours per day.If the power company charges 10¢ for each kilowatt-hour of electric energy used,estimate the yearly cost to operate the bulb if it is used every day for a 365-day year.

For the circuit shown in the figure,write the Kirchhoff current equation for the node labeled A.Notice the directions of the currents!

A 4.0-Ω resistor is connected with a 12-Ω resistor and this combination is connected across an ideal dc power supply with V = 6.0 V,as shown in the figure.When there is a total current I through the power supply,what is the current through the 12-Ω resistor?

A certain 20-A circuit breaker trips when the current in it equals 20 A.What is the maximum number of 100-W light bulbs you can connect in parallel in an ideal 120-V dc circuit without tripping this circuit breaker?

What is the current through a 40.0−m40.0 - \mathrm { m }40.0−m length of metal wire with a radius of 0.0 mm0.0 \mathrm {~mm}0.0 mm when it is connected to a 16.0 V ? 16.0 \mathrm {~V} \text { ? }16.0 V ? power source? The resistivity of the metal is 1.68 × 10-8 Ω ∙ m.

If V = 20 V and the battery is ideal,what is the current through R3 in the figure?

A 7.0-Ω resistor is connected across the terminals of a battery having an internal emf of 10 V.If there is a 0.50-A current through the circuit,what is the internal resistance of the battery?

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference,the current through the wire is 2.0 amps.What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 Ω ∙ m.

A 9.0-V battery costs $1.49 and will run a portable CD player for 6.0 hours before running down and needing to be replaced.If this battery supplies a current of 25 mA to the player,what is the cost of the energy provided by the battery in dollars per kWh?

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

A multiloop circuit is shown in the figure.Find the emf ε1 if the batteries are ideal.(It is not necessary to solve the entire circuit.)

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

Three resistors of 12 Ω,12 Ω,and 6.0 Ω are connected together,and an ideal 12-V battery is connected across the combination.What is the current through the battery if they are connected (a)in series or (b)in parallel?

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

What is the current through a $40.0 - \mathrm { m }$ length of metal wire with a radius of $0.0 \mathrm {~mm}$ when it is connected to a $16.0 \mathrm {~V} \text { ? }$ power source? The resistivity of the metal is 1.68 × 10^-8 Ω ∙ m.

If V = 20 V and the battery is ideal,what is the current through R₃ in the figure?

When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference,the current through the wire is 2.0 amps.What is the diameter of this wire? The resistivity of copper is 1.72 × 10^-8Ω ∙ m.

A multiloop circuit is shown in the figure.Find the emf ε₁ if the batteries are ideal.(It is not necessary to solve the entire circuit.)