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A circuit contains a 6.0-V battery, a 4.0-W resistor, a 0.60-µF capacitor, an ammeter, and a switch all in series.What will be the current reading immediately after the switch is closed? A circuit contains a 6.0-V battery, a 4.0-W resistor, a 0.60-µF capacitor, an ammeter, and a switch all in series.What will be the current reading immediately after the switch is closed? A) zero B) 0.75 A C) 1.5 A D) 10 A


A) zero
B) 0.75 A
C) 1.5 A
D) 10 A

E) A) and D)
F) C) and D)

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C

Using a capacitor and two different value resistors, which of the following combinations in an RC circuit would give the greatest time constant?


A) the capacitor in series with both resistors in series with each other
B) the capacitor in series with both resistors in parallel with each other
C) the capacitor in series with the higher value resistor
D) the capacitor in series with the lower value resistor

E) A) and C)
F) All of the above

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

E) A) and B)
F) None of the above

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Three resistors, each with resistance R1, are in series in a circuit.They are replaced by one equivalent resistor, R.Comparing this resistor to the first resistor of the initial circuit, which of the following is true?


A) The current through R equals the current through R1.
B) The voltage across R equals the voltage across R1.
C) The power given off by R equals the power given off by R1.
D) R is less than R1.

E) A) and B)
F) All of the above

Correct Answer

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How much current is flowing in one of the 10-W resistors? How much current is flowing in one of the 10-W resistors? A) 0.8 A B) 2.0 A C) 1.6 A D) 2.4 A


A) 0.8 A
B) 2.0 A
C) 1.6 A
D) 2.4 A

E) A) and B)
F) B) and C)

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The two ends of a 3.0-W resistor are connected to a 9.0-V battery.What is the total power delivered by the battery to the circuit?


A) 3.0 W
B) 27 W
C) 0.33 W
D) 0.11 W

E) A) and B)
F) All of the above

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What is the equivalent resistance for these 3.00-W resistors? What is the equivalent resistance for these 3.00-W resistors? A) 1.33 W B) 2.25 W C) 3.00 W D) 7.50 W


A) 1.33 W
B) 2.25 W
C) 3.00 W
D) 7.50 W

E) B) and C)
F) A) and D)

Correct Answer

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Which two resistors are in parallel with each other? Which two resistors are in parallel with each other? A) R and R<sub>4</sub> B) R<sub>2</sub> and R<sub>3</sub> C) R<sub>2</sub> and R<sub>4</sub> D) R and R<sub>1</sub>


A) R and R4
B) R2 and R3
C) R2 and R4
D) R and R1

E) A) and B)
F) A) and C)

Correct Answer

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In an RC circuit using two capacitors in series with two resistors, which of the following combinations would give the greatest time constant?


A) both capacitors in series placed in series with both resistors in series
B) both capacitors in parallel placed in series with both resistors in parallel
C) both capacitors in series placed in series with both resistors in parallel
D) both capacitors in parallel placed in series with both resistors in series

E) B) and C)
F) A) and C)

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What is the current flowing through the 2-W resistor? What is the current flowing through the 2-W resistor? A) 2 A B) 3 A C) 4 A D) 6 A


A) 2 A
B) 3 A
C) 4 A
D) 6 A

E) None of the above
F) A) and C)

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Four 1.5-volt AA batteries in series power a transistor radio.If the batteries hold a total charge of 240 C, how long will they last if the radio has a resistance of 200 W?


A) 1.1 h
B) 2.2 h
C) 4.1 h
D) 13 h

E) None of the above
F) B) and C)

Correct Answer

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B

Three resistors with values R1, R2 and R3, respectively, are connected in parallel.Which of the following expresses the total resistance, RT, of the three resistors when connected in parallel?


A) RT = R1 + R2 + R3
B) RT = (1/R1 + 1/R2 + 1/R3)
C) RT = R1 = R2 = R3
D) RT = (1/R1 + 1/R2 + 1/R3) -1

E) None of the above
F) All of the above

Correct Answer

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Using a resistor and two different value capacitors, which of the following combinations in an RC circuit would give the greatest time constant?


A) the resistor in series with both capacitors in series with each other
B) the resistor in series with both capacitors in parallel with each other
C) the resistor in series with the larger value capacitor
D) the resistor in series with the lower value capacitor

E) A) and D)
F) B) and C)

Correct Answer

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B

A voltage source of 10 V is connected to a series RC circuit where R = 2.0 * 106 W, and C = 3.0 µF.Find the amount of time required for the current in the circuit to decay to 5% of its original value. Hint: This is the same amount of time for the capacitor to reach 95% of its maximum charge.


A) 3.0 s
B) 6.0 s
C) 9.0 s
D) 18 s

E) A) and B)
F) B) and D)

Correct Answer

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A 10-V-emf battery is connected in series with the following: a 2-mF capacitor, a 2-W resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor.After the switch has been closed for a relatively long period (several seconds, say) , what are the current and capacitor voltage readings, respectively? A 10-V-emf battery is connected in series with the following: a 2-mF capacitor, a 2-W resistor, an ammeter, and a switch, initially open; a voltmeter is connected in parallel across the capacitor.After the switch has been closed for a relatively long period (several seconds, say) , what are the current and capacitor voltage readings, respectively? A) zero A, 10 V B) zero A, zero V C) 5 A, zero V D) 5 A, 10 V


A) zero A, 10 V
B) zero A, zero V
C) 5 A, zero V
D) 5 A, 10 V

E) C) and D)
F) B) and C)

Correct Answer

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Consider the circuit shown in the figure.What power is dissipated by the entire circuit? Consider the circuit shown in the figure.What power is dissipated by the entire circuit? A) 14 W B) 28 W C) 52 W D) 112 W


A) 14 W
B) 28 W
C) 52 W
D) 112 W

E) B) and D)
F) A) and B)

Correct Answer

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A hair dryer draws 1 200 W, a curling iron draws 800 W, and an electric light fixture draws 500 W.If all three of these appliances are operating in parallel on a 120-V circuit, what is the total current drawn?


A) 19.4 A
B) 20.8 A
C) 25.4 A
D) 36.7 A

E) None of the above
F) B) and D)

Correct Answer

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What is Kirchhoff's 1st equation for this junction? What is Kirchhoff's 1st equation for this junction? A) I<sub>1</sub> = I<sub>2</sub> + I<sub>3</sub> B) I<sub>2</sub> = I<sub>1</sub>+ I<sub>2</sub> C) I<sub>3</sub> = I<sub>1</sub> + I<sub>2</sub> D) I<sub>1</sub> + I<sub>2</sub> + I<sub>3</sub> = 0


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

E) B) and D)
F) None of the above

Correct Answer

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Three resistors, with values of 2.0, 4.0 and 8.0 W, respectively, are connected in parallel.What is the overall resistance of this combination?


A) 0.58 W
B) 1.1 W
C) 7.0 W
D) 14.0 W

E) A) and D)
F) B) and C)

Correct Answer

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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?


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.

E) A) and D)
F) A) and C)

Correct Answer

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