Question 1

If ε = 24 V,at what rate is thermal energy generated in the 20-Ω resistor?

Accepted Answer

A) 13 W 
B) 3.2 W 
C) 23 W 
D) 39 W 
A) 13 W 
B) 3.2 W 
C) 23 W 
D) 39 W

Question 2

Three resistors connected in series have individual voltages labeled ΔV1,ΔV2 and ΔV3,respectively.Which of the following expresses the value of the total voltage ΔVT taken over the three resistors together?

Accepted Answer

A) ΔVT = ΔV1 + ΔV2 + ΔV3 
B) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3) 
C) ΔVT = ΔV1 = ΔV2 = ΔV3 
D) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3)−1 
A) ΔVT = ΔV1 + ΔV2 + ΔV3 
B) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3) 
C) ΔVT = ΔV1 = ΔV2 = ΔV3 
D) ΔVT = (1/ΔV1 + 1/ΔV2 + 1/ΔV3)−1

Question 3

The two ends of a 6.60-Ω resistor are connected to a 14.2-V battery.What is the total power delivered by the battery to the circuit?

Accepted Answer

A) 0.326 W 
B) 30.6 W 
C) 2.15 W 
D) 619 W 
A) 0.326 W 
B) 30.6 W 
C) 2.15 W 
D) 619 W

Question 4

Four 1.5-volt AA batteries in series power a transistor radio.If the batteries hold a total charge of 200 C,how long will they last if the radio has a resistance of 200 Ω?

Accepted Answer

A) 6.0 h 
B) 1.9 h 
C) 2.6 h 
D) 1.4 h 
E) 2.4 h 
A) 6.0 h 
B) 1.9 h 
C) 2.6 h 
D) 1.4 h 
E) 2.4 h

Question 5

A series RC circuit has a time constant of 0.900 s. The battery has an emf of 24.0 V, and the maximum current in the circuit is 0.500 mA.
-What is the capacitance?

Accepted Answer

A) 1.80 μF 
B) 43.2 μF 
C) 18.8 μF 
D) 53.3 μF 
A) 1.80 μF 
B) 43.2 μF 
C) 18.8 μF 
D) 53.3 μF

Question 6

The internal resistances of an ideal voltmeter and an ideal ammeter are respectively (ideal meaning the behavior of the system is not changed when using the meter):

Accepted Answer

A) zero and zero. 
B) infinite and infinite. 
C) zero and infinite. 
D) infinite and zero. 
A) zero and zero. 
B) infinite and infinite. 
C) zero and infinite. 
D) infinite and zero.

Question 7

In a circuit involving resistance and capacitance,which of the following choices would result in the longest time constant?

Accepted Answer

A) R = 100 Ω,C = 30 μF 
B) R = 300 Ω,C = 150 μF 
C) R = 75 Ω,C = 75 μF 
D) R = 200 Ω,C = 200 μF 
A) R = 100 Ω,C = 30 μF 
B) R = 300 Ω,C = 150 μF 
C) R = 75 Ω,C = 75 μF 
D) R = 200 Ω,C = 200 μF

Question 8

Three 6.0-Ω resistors are connected in parallel.What is their equivalent resistance?

Accepted Answer

A) 0.083 Ω 
B) 3.0 Ω 
C) 0.50 Ω 
D) 2.0 Ω 
E) 6.0 Ω 
A) 0.083 Ω 
B) 3.0 Ω 
C) 0.50 Ω 
D) 2.0 Ω 
E) 6.0 Ω

Question 9

Three resistors connected in series each carry currents labeled I1,I2 and I3.Which of the following expresses the value of the total current IT in the system made up of the three resistors in series?

Accepted Answer

A) IT = I1 + I2 + I3 
B) IT = (1/I1 + 1/I2 + 1/I3) 
C) IT = I1 = I2 = I3 
D) IT = (1/I1 + 1/I2 + 1/I3)−1 
A) IT = I1 + I2 + I3 
B) IT = (1/I1 + 1/I2 + 1/I3) 
C) IT = I1 = I2 = I3 
D) IT = (1/I1 + 1/I2 + 1/I3)−1

Question 10

Resistors of values 7 Ω,15 Ω,and 25 Ω are connected in parallel across a fresh battery.Which resistor dissipates the greatest power?

Accepted Answer

A) the 7-Ω resistor 
B) the 15-Ω resistor 
C) the 25-Ω resistor 
D) All dissipate the same power when in parallel. 
A) the 7-Ω resistor 
B) the 15-Ω resistor 
C) the 25-Ω resistor 
D) All dissipate the same power when in parallel.

Question 11

A series RC circuit consists of a battery,a switch,a resistor,and a capacitor.In terms of the time constant  
Of this circuit,how long after the switch is closed does the current in the circuit reach half of its maximum value?

Accepted Answer

A) 0.500   
B) 1.50   
C) 0.693   
D) 2.00   
A) 0.500   
B) 1.50   
C) 0.693   
D) 2.00

Question 12

To find the equivalent resistance of the combination of resistors shown across the 28-V battery by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel,the first step would be which of the following?

Accepted Answer

A) Combine the two 10 Ω in parallel since they can be done in your head. 
B) Combine,in series,the two 3-Ω resistors and the 4-Ω resistor in the right-hand branch of the circuit. 
C) Combine the seven resistors (two 5 Ω,three 3 Ω,one 2 Ω and one 4 Ω)in the outer loop of the circuit in series. 
D) This problem cannot be done by combining series and parallel resistors. 
A) Combine the two 10 Ω in parallel since they can be done in your head. 
B) Combine,in series,the two 3-Ω resistors and the 4-Ω resistor in the right-hand branch of the circuit. 
C) Combine the seven resistors (two 5 Ω,three 3 Ω,one 2 Ω and one 4 Ω)in the outer loop of the circuit in series. 
D) This problem cannot be done by combining series and parallel resistors.

Question 13

Three resistors connected in parallel each carry currents labeled I1,I2 and I3.Which of the following expresses the value of the total current IT in the combined system?

Accepted Answer

A) IT = I1 + I2 + I3 
B) IT = (1/I1 + 1/I2 + 1/I3) 
C) IT = I1 = I2 = I3 
D) IT = (1/I1 + 1/I2 + 1/I3)−1 
A) IT = I1 + I2 + I3 
B) IT = (1/I1 + 1/I2 + 1/I3) 
C) IT = I1 = I2 = I3 
D) IT = (1/I1 + 1/I2 + 1/I3)−1

Question 14

The two ends of a 2.00-Ω resistor are connected to a 8.20-V battery.What is the current through the resistor?

Accepted Answer

A) 16.4 A 
B) 0.244 A 
C) 4.10 A 
D) 10.2 A 
E) 6.20 A 
A) 16.4 A 
B) 0.244 A 
C) 4.10 A 
D) 10.2 A 
E) 6.20 A

Question 15

If I1 goes to the right through R1,I2 goes to the right through R2,and I3 goes to the right through R3,what is the resulting equation resulting from applying Kirchhoff's junction rule at point b?

Accepted Answer

A) I1 + I2 + I3 = 0 
B) I1 + I2 - I3 = 0 
C) I1 - I2 + I3 = 0 
D) I1 - I2 - I3 = 0 
A) I1 + I2 + I3 = 0 
B) I1 + I2 - I3 = 0 
C) I1 - I2 + I3 = 0 
D) I1 - I2 - I3 = 0

Question 16

Three resistors,each of different value,are used in a circuit with a power source supplying 12 volts.For which of the following resistor combinations is the total power supplied the greatest?

Accepted Answer

A) all three resistors in series 
B) all three resistors in parallel 
C) two of the resistors in parallel with the third resistor in series with the parallel pair 
D) This cannot be found until it is known which resistor is in series with the parallel pair. 
A) all three resistors in series 
B) all three resistors in parallel 
C) two of the resistors in parallel with the third resistor in series with the parallel pair 
D) This cannot be found until it is known which resistor is in series with the parallel pair.

Question 17

Consider the circuit shown in the figure.What power is dissipated by the entire circuit?

Accepted Answer

A) 14 W 
B) 28 W 
C) 52 W 
D) 110 W 
A) 14 W 
B) 28 W 
C) 52 W 
D) 110 W

Question 18

If I = 2.0 mA and the potential difference,VA - VB = +30 V in the circuit segment shown,determine the charge and polarity of the capacitor.

Accepted Answer

A) 1.5 mC,left plate is positive 
B) 1.5 mC,right plate is positive 
C) 0.45 mC,left plate is positive 
D) 0.45 mC,right plate is positive 
A) 1.5 mC,left plate is positive 
B) 1.5 mC,right plate is positive 
C) 0.45 mC,left plate is positive 
D) 0.45 mC,right plate is positive

Question 19

A 1 000-V battery,a 3 000-Ω resistor,and a 0.50-µF capacitor are connected in series with a switch.The capacitor is initially uncharged.What is the value of the current the moment after the switch is closed?

Accepted Answer

A) 0.39 A 
B) 0.33 A 
C) 0.84 A 
D) 2 000 A 
A) 0.39 A 
B) 0.33 A 
C) 0.84 A 
D) 2 000 A

Question 20

A fan,electric heater,and lamp are connected in parallel across a 120-V line.The resistances are Rlamp = 148 Ω,Rheater = 32 Ω,and Rfan = 48 Ω.What is the total current supplied to the circuit?

Accepted Answer

A) 17.0 A 
B) 7.06 A 
C) 0.526 A 
D) 1.90 A 
A) 17.0 A 
B) 7.06 A 
C) 0.526 A 
D) 1.90 A

Exam 18: Direct-Current Circuits

If ε = 24 V,at what rate is thermal energy generated in the 20-Ω resistor?

Three resistors connected in series have individual voltages labeled ΔV1,ΔV2 and ΔV3,respectively.Which of the following expresses the value of the total voltage ΔVT taken over the three resistors together?

The two ends of a 6.60-Ω resistor are connected to a 14.2-V battery.What is the total power delivered by the battery to the circuit?

Four 1.5-volt AA batteries in series power a transistor radio.If the batteries hold a total charge of 200 C,how long will they last if the radio has a resistance of 200 Ω?

A series RC circuit has a time constant of 0.900 s. The battery has an emf of 24.0 V, and the maximum current in the circuit is 0.500 mA. -What is the capacitance?

The internal resistances of an ideal voltmeter and an ideal ammeter are respectively (ideal meaning the behavior of the system is not changed when using the meter):

In a circuit involving resistance and capacitance,which of the following choices would result in the longest time constant?

Three 6.0-Ω resistors are connected in parallel.What is their equivalent resistance?

Three resistors connected in series each carry currents labeled I1,I2 and I3.Which of the following expresses the value of the total current IT in the system made up of the three resistors in series?

Resistors of values 7 Ω,15 Ω,and 25 Ω are connected in parallel across a fresh battery.Which resistor dissipates the greatest power?

A series RC circuit consists of a battery,a switch,a resistor,and a capacitor.In terms of the time constant Of this circuit,how long after the switch is closed does the current in the circuit reach half of its maximum value?

To find the equivalent resistance of the combination of resistors shown across the 28-V battery by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel,the first step would be which of the following?

Three resistors connected in parallel each carry currents labeled I1,I2 and I3.Which of the following expresses the value of the total current IT in the combined system?

The two ends of a 2.00-Ω resistor are connected to a 8.20-V battery.What is the current through the resistor?

If I1 goes to the right through R1,I2 goes to the right through R2,and I3 goes to the right through R3,what is the resulting equation resulting from applying Kirchhoff's junction rule at point b?

Three resistors,each of different value,are used in a circuit with a power source supplying 12 volts.For which of the following resistor combinations is the total power supplied the greatest?

Consider the circuit shown in the figure.What power is dissipated by the entire circuit?

If I = 2.0 mA and the potential difference,VA - VB = +30 V in the circuit segment shown,determine the charge and polarity of the capacitor.

A 1 000-V battery,a 3 000-Ω resistor,and a 0.50-µF capacitor are connected in series with a switch.The capacitor is initially uncharged.What is the value of the current the moment after the switch is closed?

A fan,electric heater,and lamp are connected in parallel across a 120-V line.The resistances are Rlamp = 148 Ω,Rheater = 32 Ω,and Rfan = 48 Ω.What is the total current supplied to the circuit?

Units, Trigonometry, and Vectors

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Newtons Laws of Motion

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The Laws of Thermodynamics

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Filters

Three resistors connected in series have individual voltages labeled ΔV₁,ΔV₂ and ΔV₃,respectively.Which of the following expresses the value of the total voltage ΔV_T taken over the three resistors together?

Three resistors connected in series each carry currents labeled I₁,I₂ and I₃.Which of the following expresses the value of the total current I_T in the system made up of the three resistors in series?

Three resistors connected in parallel each carry currents labeled I₁,I₂ and I₃.Which of the following expresses the value of the total current I_T in the combined system?

If I₁ goes to the right through R₁,I₂ goes to the right through R₂,and I₃ goes to the right through R₃,what is the resulting equation resulting from applying Kirchhoff's junction rule at point b?

If I = 2.0 mA and the potential difference,V_A - V_B = +30 V in the circuit segment shown,determine the charge and polarity of the capacitor.

A fan,electric heater,and lamp are connected in parallel across a 120-V line.The resistances are R_lamp = 148 Ω,R_heater = 32 Ω,and R_fan = 48 Ω.What is the total current supplied to the circuit?