Question 1

A 4.0-Ω resistor is connected with a 12-Ω resistor and both of these are connected across an ideal dc power supply with voltage V as shown in the figure.If the total current through this circuit is I = 2.0 A,what is the current through the 4.0-Ω resistor?

Accepted Answer

A) 2.0 A 
B) 2.5 A 
C) 0.5 A 
D) 3.0 A 
E) 1.5 A

Question 2

Two resistors in series are equivalent to 9.0 Ω,and in parallel they are equivalent to 2.0 Ω.What are the resistances of these two resistors?

Accepted Answer

The answer of Two resistors in series are equivalent to...

Question 3

When unequal resistors are connected in series across an ideal battery,

Accepted Answer

A) the same power is dissipated in each one. 
B) the potential difference across each is the same. 
C) the current through each is the same. 
D) the equivalent resistance of the circuit is less than that of the smallest resistor. 
E) the equivalent resistance of the circuit is equal to the average of all the resistances.

Question 4

A 120-Ω laboratory resistor is rated at 0.25 W.What is the safe current through the resistor?

Accepted Answer

A) 30 A 
B) 2.1 mA 
C) 22 mA 
D) 46 mA

Question 5

Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery.The resistivity of the nichrome is 1.00 × 10-6 Ω ∙ m.

Accepted Answer

A) 30.9 A 
B) 61.8 A 
C) 0.388 A 
D) 0.776 A

Question 6

Four resistors are connected across an ideal dc battery with voltage V,as shown in the figure.If the total current in this circuit is I = 1 A,what is the value of the voltage V?

Accepted Answer

A) 2 V 
B) 4 V 
C) 6 V 
D) 8 V 
E) 10 V

Question 7

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 Ω ∙ m?

Accepted Answer

A) 0.00012 Ω 
B) 0.00021 Ω 
C) 0.0012 Ω 
D) 0.0021 Ω

Question 8

A flashlight draws 0.133 A from a 3.0-V battery pack.In 2.0 minutes (a)how much charge flows from the battery,(b)how much energy does the battery supply,and (c)how many electrons have passed any point in the circuit every second?

Accepted Answer

The answer of A flashlight draws 0.133 A from a...

Question 9

A battery has an emf ε = 12 V and an internal resistance r = 2.0 Ω,as shown in the figure.When a current of 6.0 A is drawn from the battery,the terminal voltage of the battery Vab is closest to

Accepted Answer

A) 0 V. 
B) +12 V. 
C) +24 V. 
D) 2.0 V. 
E) 10 V.

Question 10

As more resistors are added in series to 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 11

What is the equivalent resistance in the circuit shown in the figure?

Accepted Answer

A) 80 Ω 
B) 55 Ω 
C) 50 Ω 
D) 35 Ω

Question 12

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current through the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

Accepted Answer

A) 2.25 A 
B) 0.75 A 
C) 4.5 A 
D) 9.5 A 
E) 6.4 A

Question 13

A 2.0-Ω resistor is in series with a parallel combination of 4.0-Ω,6.0-Ω,and 12-Ω resistors.What is the equivalent resistance of this system?

Accepted Answer

A) 24 Ω 
B) 4.0 Ω 
C) 1.8 Ω 
D) 2.7 Ω

Question 14

The figure shows a graph of the power dissipated in a resistor as a function of the resistance.What quantity does the slope of this graph represent?

Accepted Answer

A) the current in the resistor 
B) the potential difference across the resistor 
C) the reciprocal of the current in the resistor 
D) the square of the current in the resistor 
E) the resistivity of the resistor

Question 15

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor.If you want to achieve the smallest possible resistance,you should attach the leads to the opposite faces that measure

Accepted Answer

A) 3 cm × 5 cm. 
B) 3 cm × 8 cm. 
C) 5 cm × 8 cm. 
D) Any pair of faces produces the same resistance.

Question 16

A 200-W light bulb is connected across a 110-V dc power supply.What is the current through this bulb?

Accepted Answer

A) 0.90 A 
B) 0.36 A 
C) 0 A 
D) 0.60 A 
E) 1.8 A

Question 17

For the circuit shown in the figure,calculate the emf's ε₁ and ε₃,assuming that the batteries are ideal.Note that two currents are shown.

Accepted Answer

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

Question 18

Three resistors of resistances 4.0 Ω,6.0 Ω,and 10 Ω are connected in parallel.If this combination is now connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10-Ω resistor?

Accepted Answer

A) 0.59 A 
B) 2.7 A 
C) 11 A 
D) 16 A

Question 19

If emf of the ideal battery is V = 100 V,what is the potential difference across R5 for the circuit shown in the figure?

Accepted Answer

A) 19 V 
B) 40 V 
C) 75 V 
D) 77 V

Question 20

A resistance heater is rated at 1200 W when operating at 110 V dc.What current will it draw?

Accepted Answer

A) 0.090 A 
B) 1.0 A 
C) 11 A 
D) 12 A

Exam 17: Dc Circuits

A 4.0-Ω resistor is connected with a 12-Ω resistor and both of these are connected across an ideal dc power supply with voltage V as shown in the figure.If the total current through this circuit is I = 2.0 A,what is the current through the 4.0-Ω resistor?

Two resistors in series are equivalent to 9.0 Ω,and in parallel they are equivalent to 2.0 Ω.What are the resistances of these two resistors?

When unequal resistors are connected in series across an ideal battery,

A 120-Ω laboratory resistor is rated at 0.25 W.What is the safe current through the resistor?

Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery.The resistivity of the nichrome is 1.00 × 10^-6 Ω ∙ m.

Four resistors are connected across an ideal dc battery with voltage V,as shown in the figure.If the total current in this circuit is I = 1 A,what is the value of the voltage V?

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10^-8 Ω ∙ m?

A flashlight draws 0.133 A from a 3.0-V battery pack.In 2.0 minutes (a)how much charge flows from the battery,(b)how much energy does the battery supply,and (c)how many electrons have passed any point in the circuit every second?

A battery has an emf ε = 12 V and an internal resistance r = 2.0 Ω,as shown in the figure.When a current of 6.0 A is drawn from the battery,the terminal voltage of the battery V_ab is closest to

As more resistors are added in series to a constant voltage source,the power supplied by the source

What is the equivalent resistance in the circuit shown in the figure?

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current through the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

A 2.0-Ω resistor is in series with a parallel combination of 4.0-Ω,6.0-Ω,and 12-Ω resistors.What is the equivalent resistance of this system?

The figure shows a graph of the power dissipated in a resistor as a function of the resistance.What quantity does the slope of this graph represent?

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor.If you want to achieve the smallest possible resistance,you should attach the leads to the opposite faces that measure

A 200-W light bulb is connected across a 110-V dc power supply.What is the current through this bulb?

For the circuit shown in the figure,calculate the emf's ε₁ and ε₃,assuming that the batteries are ideal.Note that two currents are shown.

Three resistors of resistances 4.0 Ω,6.0 Ω,and 10 Ω are connected in parallel.If this combination is now connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10-Ω resistor?

If emf of the ideal battery is V = 100 V,what is the potential difference across R₅ for the circuit shown in the figure?

A resistance heater is rated at 1200 W when operating at 110 V dc.What current will it draw?

Exam 17: Dc Circuits

A 4.0-Ω resistor is connected with a 12-Ω resistor and both of these are connected across an ideal dc power supply with voltage V as shown in the figure.If the total current through this circuit is I = 2.0 A,what is the current through the 4.0-Ω resistor?

Two resistors in series are equivalent to 9.0 Ω,and in parallel they are equivalent to 2.0 Ω.What are the resistances of these two resistors?

When unequal resistors are connected in series across an ideal battery,

A 120-Ω laboratory resistor is rated at 0.25 W.What is the safe current through the resistor?

Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery.The resistivity of the nichrome is 1.00 × 10-6 Ω ∙ m.

Four resistors are connected across an ideal dc battery with voltage V,as shown in the figure.If the total current in this circuit is I = 1 A,what is the value of the voltage V?

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 Ω ∙ m?

A flashlight draws 0.133 A from a 3.0-V battery pack.In 2.0 minutes (a)how much charge flows from the battery,(b)how much energy does the battery supply,and (c)how many electrons have passed any point in the circuit every second?

A battery has an emf ε = 12 V and an internal resistance r = 2.0 Ω,as shown in the figure.When a current of 6.0 A is drawn from the battery,the terminal voltage of the battery Vab is closest to

As more resistors are added in series to a constant voltage source,the power supplied by the source

What is the equivalent resistance in the circuit shown in the figure?

For the circuit shown in the figure,the current in the 8.0-Ω resistor is 0.50A.What is the current through the 2.0-Ω resistor? All the numbers shown are accurate to two significant figures.

A 2.0-Ω resistor is in series with a parallel combination of 4.0-Ω,6.0-Ω,and 12-Ω resistors.What is the equivalent resistance of this system?

The figure shows a graph of the power dissipated in a resistor as a function of the resistance.What quantity does the slope of this graph represent?

You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor.If you want to achieve the smallest possible resistance,you should attach the leads to the opposite faces that measure

A 200-W light bulb is connected across a 110-V dc power supply.What is the current through this bulb?

For the circuit shown in the figure,calculate the emf's ε1 and ε3,assuming that the batteries are ideal.Note that two currents are shown.

Three resistors of resistances 4.0 Ω,6.0 Ω,and 10 Ω are connected in parallel.If this combination is now connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10-Ω resistor?

If emf of the ideal battery is V = 100 V,what is the potential difference across R5 for the circuit shown in the figure?

A resistance heater is rated at 1200 W when operating at 110 V dc.What current will it draw?

Calculate the current through a 10.0-m long 22-gauge nichrome wire with a radius of 0.321 mm if it is connected across a 12.0-V battery.The resistivity of the nichrome is 1.00 × 10^-6 Ω ∙ m.

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10^-8 Ω ∙ m?

A battery has an emf ε = 12 V and an internal resistance r = 2.0 Ω,as shown in the figure.When a current of 6.0 A is drawn from the battery,the terminal voltage of the battery V_ab is closest to

For the circuit shown in the figure,calculate the emf's ε₁ and ε₃,assuming that the batteries are ideal.Note that two currents are shown.

If emf of the ideal battery is V = 100 V,what is the potential difference across R₅ for the circuit shown in the figure?