Question 1

A lamp uses an average power of 55 W when it is connected to an rms voltage of 120 V.Which entry in the following table is correct for this circuit?

Accepted Answer

The answer of A lamp uses an average power of...

Question 2

A 10.0-µF capacitor is charged so that the potential difference between its plates is 10.0 V.
A 5.0-µF capacitor is similarly charged so that the potential difference between its plates is 5.0 V.
The two charged capacitors are then connected to each other in parallel with positive plate connected to positive plate and negative plate connected to negative plate.
-What is the final potential difference across the plates of the capacitors when they are connected in parallel?

Accepted Answer

A) 5.0 V 
B) 6.7 V 
C) 7.5 V 
D) 8.3 V 
E) 10 V 
A) 5.0 V 
B) 6.7 V 
C) 7.5 V 
D) 8.3 V 
E) 10 V

Question 3

What is the total power dissipated in the two resistors in the circuit shown?

Accepted Answer

A) 10 W 
B) 15 W 
C) 33 W 
D) 67 W 
E) 670 W 
A) 10 W 
B) 15 W 
C) 33 W 
D) 67 W 
E) 670 W

Question 4

Three resistors and two batteries are connected as shown in the circuit diagram.What is the magnitude of the current through the 12-V battery?

Accepted Answer

A) 0.15 A 
B) 0.82 A 
C) 0.30 A 
D) 0.67 A 
E) 0.52 A 
A) 0.15 A 
B) 0.82 A 
C) 0.30 A 
D) 0.67 A 
E) 0.52 A

Question 5

A 4-A current is maintained in a simple circuit with a total resistance of 2  .How much energy is delivered in forty five seconds?

Accepted Answer

A) 1440 J 
B) 96 J 
C) 360 J 
D) 720 J 
E) 240 J 
A) 1440 J 
B) 96 J 
C) 360 J 
D) 720 J 
E) 240 J

Question 6

Five resistors are connected as shown.What is the equivalent resistance between points A and B?

Accepted Answer

A) 6.8   
B) 9.2   
C) 3.4   
D) 2.  
E) 16   
A) 6.8   
B) 9.2   
C) 3.4   
D) 2.  
E) 16

Question 7

Three resistors are placed in a circuit as shown.The potential difference between points A and B is 30 V.
  
-What is the equivalent resistance between the points A and B?

Accepted Answer

A) 10   
B) 20   
C)   
D) 50   
E) 100   
A) 10   
B) 20   
C)   
D) 50   
E) 100

Question 8

The figure shows a simple RC circuit consisting of a 100.0-V battery in series with a 10.0-µF capacitor and a resistor.Initially,the switch S is open and the capacitor is uncharged.Two seconds after the switch is closed,the voltage across the resistor is 37 V.
  
-Determine the numerical value of the resistance R.

Accepted Answer

A) 0.37   
B) 2.70   
C) 5.0 × 10⁴   
D) 2.0 × 10⁵  
E) 4.3 × 10⁵   
A) 0.37   
B) 2.70   
C) 5.0 × 10⁴   
D) 2.0 × 10⁵  
E) 4.3 × 10⁵

Question 9

How much energy is stored in the combination of capacitors shown?

Accepted Answer

A) 0.01 J 
B) 0.02 J 
C) 0.03 J 
D) 0.04 J 
E) 0.05 J 
A) 0.01 J 
B) 0.02 J 
C) 0.03 J 
D) 0.04 J 
E) 0.05 J

Question 10

Which one of the following statements concerning resistors in series is true?

Accepted Answer

A) The voltage across each resistor is the same. 
B) The current through each resistor is the same. 
C) The power dissipated by each resistor is the same. 
D) The rate at which charge flows through each resistor depends on its resistance. 
E) The total current through the resistors is the sum of the current through each resistor. 
A) The voltage across each resistor is the same. 
B) The current through each resistor is the same. 
C) The power dissipated by each resistor is the same. 
D) The rate at which charge flows through each resistor depends on its resistance. 
E) The total current through the resistors is the sum of the current through each resistor.

Question 11

Three resistors and two 10.0-V batteries are arranged as shown in the circuit diagram.Which one of the following entries in the table is correct?

Accepted Answer

The answer of Three resistors and two 10.0-V batteries are...

Question 12

Five resistors are connected as shown in the diagram.The potential difference between points A and B is 15 V.
  
-What is the current in the 2.7-  resistor?

Accepted Answer

A) 12 A 
B) 0.8 A 
C) 2.2 A 
D) 0.4 A 
E) 1.2 A 
A) 12 A 
B) 0.8 A 
C) 2.2 A 
D) 0.4 A 
E) 1.2 A

Question 13

Complete the following statement: The electromotive force is

Accepted Answer

A) the maximum potential difference between the terminals of a battery. 
B) the force that accelerates electrons through a wire when a battery is connected to it. 
C) the force that accelerates protons through a wire when a battery is connected to it. 
D) the maximum capacitance between the terminals of a battery. 
E) the maximum electric potential energy stored within a battery. 
A) the maximum potential difference between the terminals of a battery. 
B) the force that accelerates electrons through a wire when a battery is connected to it. 
C) the force that accelerates protons through a wire when a battery is connected to it. 
D) the maximum capacitance between the terminals of a battery. 
E) the maximum electric potential energy stored within a battery.

Question 14

The figure shows a circuit.The switch S can be closed on either point A or C,but not both at the same time.Use the following quantities:
V₁ = V₂ = 12 V
R₁ = R₄ = 1.0 W
R₂ = R₃ = 2.0 W
  
-At what rate is energy dissipated by R₁ when the switch S is closed on A?

Accepted Answer

A) 1 W 
B) 4 W 
C) 9 W 
D) 36 W 
E) 144 W 
A) 1 W 
B) 4 W 
C) 9 W 
D) 36 W 
E) 144 W

Question 15

Which one of the following quantities can be converted to kilowatt - hours (kWh)?

Accepted Answer

A) 2.0 A 
B) 8.3 V 
C) 5.8 J 
D) 9.6 W 
E) 6.2 C/V 
A) 2.0 A 
B) 8.3 V 
C) 5.8 J 
D) 9.6 W 
E) 6.2 C/V

Question 16

An RC circuit consists of a resistor with resistance 1.0  ,a 120-V battery,and two capacitors,C₁ and C₂,with capacitances of 20.0 µF and 60.0 µF,respectively.Initially,the capacitors are uncharged;and the switch is closed at t = 0 s.
-Determine the total charge on both capacitors two time constants after the switch is closed.

Accepted Answer

A) 1.3 × 10-³ C 
B) 2.2 × 10-³ C 
C) 4.7 × 10-³ C 
D) 6.1 × 10-³ C 
E) 8.3 × 10-³ C 
A) 1.3 × 10-³ C 
B) 2.2 × 10-³ C 
C) 4.7 × 10-³ C 
D) 6.1 × 10-³ C 
E) 8.3 × 10-³ C

Question 17

The figure shows variation of the current through the heating element with time in an iron when it is plugged into a standard 120 V,60 Hz outlet.
  
-What is the resistance of the iron?

Accepted Answer

A) 24   
B) 7.1   
C) 17   
D) 12   
E) 1.8   
A) 24   
B) 7.1   
C) 17   
D) 12   
E) 1.8

Question 18

Which one of the following statements concerning capacitors of unequal capacitance connected in series is true?

Accepted Answer

A) Each capacitor holds a different amount of charge. 
B) The equivalent capacitance of the circuit is the sum of the individual capacitances. 
C) The total voltage supplied by the battery is the sum of the voltages across each capacitor. 
D) The total positive charge in the circuit is the sum of the positive charges on each capacitor. 
E) The total voltage supplied by the battery is equal to the average voltage across all the capacitors. 
A) Each capacitor holds a different amount of charge. 
B) The equivalent capacitance of the circuit is the sum of the individual capacitances. 
C) The total voltage supplied by the battery is the sum of the voltages across each capacitor. 
D) The total positive charge in the circuit is the sum of the positive charges on each capacitor. 
E) The total voltage supplied by the battery is equal to the average voltage across all the capacitors.

Question 19

A physics student performed an experiment in which the potential difference V between the ends of a long straight wire was varied.The current I in the wire was measured at each value of the potential difference with an ammeter and the results of the experiment are shown in the table.   Which one of the following statements is the best conclusion based on the data?

Accepted Answer

A) The resistance of the wire is 20  . 
B) The wire does not obey Ohm's law. 
C) The current in the wire is directly proportional to the applied potential difference. 
D) The wire obeys Ohm's law over the range of potential differences between 5 and 30 V. 
E) The wire obeys Ohm's law over the range of potential differences between 5 and 20 V. 
A) The resistance of the wire is 20  . 
B) The wire does not obey Ohm's law. 
C) The current in the wire is directly proportional to the applied potential difference. 
D) The wire obeys Ohm's law over the range of potential differences between 5 and 30 V. 
E) The wire obeys Ohm's law over the range of potential differences between 5 and 20 V.

Question 20

Determine the length of a copper wire that has a resistance of 0.172   and cross-sectional area of 7.85 × 10-⁵ m².The resistivity of copper is 1.72 × 10-⁸   × m.

Accepted Answer

A) 873 m 
B) 250 m 
C) 78.5 m 
D) 785 m 
E) 6570 m 
A) 873 m 
B) 250 m 
C) 78.5 m 
D) 785 m 
E) 6570 m

A lamp uses an average power of 55 W when it is connected to an rms voltage of 120 V.Which entry in the following table is correct for this circuit?

What is the total power dissipated in the two resistors in the circuit shown?

Three resistors and two batteries are connected as shown in the circuit diagram.What is the magnitude of the current through the 12-V battery?

A 4-A current is maintained in a simple circuit with a total resistance of 2 .How much energy is delivered in forty five seconds?

Five resistors are connected as shown.What is the equivalent resistance between points A and B?

Three resistors are placed in a circuit as shown.The potential difference between points A and B is 30 V. -What is the equivalent resistance between the points A and B?

How much energy is stored in the combination of capacitors shown?

Which one of the following statements concerning resistors in series is true?

Three resistors and two 10.0-V batteries are arranged as shown in the circuit diagram.Which one of the following entries in the table is correct?

Five resistors are connected as shown in the diagram.The potential difference between points A and B is 15 V. -What is the current in the 2.7- resistor?

Complete the following statement: The electromotive force is

The figure shows a circuit.The switch S can be closed on either point A or C,but not both at the same time.Use the following quantities: V₁ = V₂ = 12 V R₁ = R₄ = 1.0 W R₂ = R₃ = 2.0 W -At what rate is energy dissipated by R₁ when the switch S is closed on A?

Which one of the following quantities can be converted to kilowatt - hours (kWh)?

The figure shows variation of the current through the heating element with time in an iron when it is plugged into a standard 120 V,60 Hz outlet. -What is the resistance of the iron?

Which one of the following statements concerning capacitors of unequal capacitance connected in series is true?

Determine the length of a copper wire that has a resistance of 0.172 and cross-sectional area of 7.85 × 10^-⁵ m².The resistivity of copper is 1.72 × 10^-⁸ 11ec9df8_b514_280c_8d20_295ba371075e_TB6393_11 × m.

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The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

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Electromagnetic Induction

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Exam 20: Electric Circuits

A lamp uses an average power of 55 W when it is connected to an rms voltage of 120 V.Which entry in the following table is correct for this circuit?

What is the total power dissipated in the two resistors in the circuit shown?

Three resistors and two batteries are connected as shown in the circuit diagram.What is the magnitude of the current through the 12-V battery?

A 4-A current is maintained in a simple circuit with a total resistance of 2 .How much energy is delivered in forty five seconds?

Five resistors are connected as shown.What is the equivalent resistance between points A and B?

Three resistors are placed in a circuit as shown.The potential difference between points A and B is 30 V. -What is the equivalent resistance between the points A and B?

How much energy is stored in the combination of capacitors shown?

Which one of the following statements concerning resistors in series is true?

Three resistors and two 10.0-V batteries are arranged as shown in the circuit diagram.Which one of the following entries in the table is correct?

Five resistors are connected as shown in the diagram.The potential difference between points A and B is 15 V. -What is the current in the 2.7- resistor?

Complete the following statement: The electromotive force is

The figure shows a circuit.The switch S can be closed on either point A or C,but not both at the same time.Use the following quantities: V₁ = V₂ = 12 V R₁ = R₄ = 1.0 W R₂ = R₃ = 2.0 W -At what rate is energy dissipated by R₁ when the switch S is closed on A?

Which one of the following quantities can be converted to kilowatt - hours (kWh)?

The figure shows variation of the current through the heating element with time in an iron when it is plugged into a standard 120 V,60 Hz outlet. -What is the resistance of the iron?

Which one of the following statements concerning capacitors of unequal capacitance connected in series is true?

Determine the length of a copper wire that has a resistance of 0.172 and cross-sectional area of 7.85 × 10-⁵ m².The resistivity of copper is 1.72 × 10-⁸ 11ec9df8_b514_280c_8d20_295ba371075e_TB6393_11 × m.

Fluids

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

The Principle of Linear Superposition and Interference Phenomena

Electromagnetic Induction

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Particles and Waves

Filters

Determine the length of a copper wire that has a resistance of 0.172 and cross-sectional area of 7.85 × 10^-⁵ m².The resistivity of copper is 1.72 × 10^-⁸ 11ec9df8_b514_280c_8d20_295ba371075e_TB6393_11 × m.