Question 1

An 8.00-Ω resistor is connected to a battery with internal resistance of 0.200 Ω.If the terminal voltage across the battery is 9.00 V,what is the battery's emf?

Accepted Answer

A) 8.78 Ω 
B) 9.23 Ω 
C) 0.225 Ω 
D) 0.178 Ω 
A) 8.78 Ω 
B) 9.23 Ω 
C) 0.225 Ω 
D) 0.178 Ω

Question 2

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 loop rule for a clockwise loop around the perimeter of the circuit?

Accepted Answer

A) 8.0 V + I1R1 + I3R3 = 0 
B) 8.0 V + I1R1 - I3R3 = 0 
C) 8.0 V - I1R1 + I3R3 = 0 
D) -8.0 V + I1R1 + I3R3 = 0 
A) 8.0 V + I1R1 + I3R3 = 0 
B) 8.0 V + I1R1 - I3R3 = 0 
C) 8.0 V - I1R1 + I3R3 = 0 
D) -8.0 V + I1R1 + I3R3 = 0

Question 3

How much power is being dissipated by one of the 10-Ω resistors?

Accepted Answer

A) 24 W 
B) 9.6 W 
C) 16 W 
D) 6.4 W 
A) 24 W 
B) 9.6 W 
C) 16 W 
D) 6.4 W

Question 4

A voltage source of 10.0 V is connected to a series RC circuit where R = 2.80 × 106 Ω,and C = 3.50 µF.Find the amount of time required for the current in the circuit to decay to 4.00% of its original value.Hint: This is the same amount of time for the capacitor to reach 96.0% of its maximum charge.

Accepted Answer

A) 19.1 s 
B) 13.6 s 
C) 0.143 s 
D) 31.5 s 
E) 309 s 
A) 19.1 s 
B) 13.6 s 
C) 0.143 s 
D) 31.5 s 
E) 309 s

Question 5

Which voltage is not caused by a source of emf?

Accepted Answer

A) the voltage across a charged capacitor 
B) the voltage across two copper-iron junctions at different temperatures 
C) the voltage across the terminals of a dry cell battery 
D) the voltage from an electric generator 
A) the voltage across a charged capacitor 
B) the voltage across two copper-iron junctions at different temperatures 
C) the voltage across the terminals of a dry cell battery 
D) the voltage from an electric generator

Question 6

Which resistor is in series with resistor R?

Accepted Answer

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

Question 7

Kirchhoff's rules are the junction rule and the loop rule.Which of the following statements is true?

Accepted Answer

A) Both rules are based on the conservation of charge. 
B) Both rules are based on the conservation of energy. 
C) The junction rule is based on the conservation of charge,and the loop rule is based on the conservation of energy. 
D) The junction rule is based on the conservation of energy,and the loop rule is based on the conservation of charge. 
A) Both rules are based on the conservation of charge. 
B) Both rules are based on the conservation of energy. 
C) The junction rule is based on the conservation of charge,and the loop rule is based on the conservation of energy. 
D) The junction rule is based on the conservation of energy,and the loop rule is based on the conservation of charge.

Question 8

Three resistors,with values of 3.00,7.00,and 15.0 Ω,respectively,are connected in parallel.What is the overall resistance of this combination?

Accepted Answer

A) 25.0 Ω 
B) 1.84 Ω 
C) 0.543 Ω 
D) 8.33 Ω 
E) 6.80 Ω 
A) 25.0 Ω 
B) 1.84 Ω 
C) 0.543 Ω 
D) 8.33 Ω 
E) 6.80 Ω

Question 9

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

Accepted Answer

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 
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

Question 10

A certain capacitor is charged to 10 V and then,at t = 0,allowed to discharge through a certain resistor.There will be a certain time before the voltage across the capacitor reaches 5 V.This time can be decreased for this circuit by increasing:

Accepted Answer

A) the size of the capacitor. 
B) the size of the resistor. 
C) the size of the time constant. 
D) None of the above. 
A) the size of the capacitor. 
B) the size of the resistor. 
C) the size of the time constant. 
D) None of the above.

Question 11

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?

Accepted Answer

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 
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

Question 12

In applications where electrical shocks may be more likely,such as around water in kitchens and bathrooms,special outlets called GFI's are used.What does GFI stand for?

Accepted Answer

A) get free instantly 
B) ground-fault interrupter 
C) give fast interruption 
D) gravity-free insulator 
A) get free instantly 
B) ground-fault interrupter 
C) give fast interruption 
D) gravity-free insulator

Question 13

When a light bulb is turned on,its resistance increases until it reaches operating temperature.What happens to the current in the bulb as it is warming up?

Accepted Answer

A) It stays constant. 
B) It increases. 
C) It decreases. 
D) It increases at first and then decreases. 
A) It stays constant. 
B) It increases. 
C) It decreases. 
D) It increases at first and then decreases.

Question 14

The ammeter shown in the figure reads 4.4 A,RS1U1B11S1U1B0 = 7.0 Ω,RS1U1B12S1U1B0 = 5.0 Ω,and RS1U1B13S1U1B0 = 2.0 Ω.  
-What is I2?

Accepted Answer

A) -1.7 A 
B) 2.2 A 
C) 6.1 A 
D) -5.0 A 
A) -1.7 A 
B) 2.2 A 
C) 6.1 A 
D) -5.0 A

Question 15

What is the maximum number of 60-W light bulbs you can connect in parallel in a 100-V home circuit without tripping the 30-A circuit breaker?

Accepted Answer

A) 18 
B) 24 
C) 49 
D) 36 
E) 56 
A) 18 
B) 24 
C) 49 
D) 36 
E) 56

Question 16

The ammeter shown in the figure reads 4.4 A,RS1U1B11S1U1B0 = 7.0 Ω,RS1U1B12S1U1B0 = 5.0 Ω,and RS1U1B13S1U1B0 = 2.0 Ω.  
-What is I1?

Accepted Answer

A) -1.7 A 
B) 3.1 A 
C) 0.63 A 
D) -1.4 A 
A) -1.7 A 
B) 3.1 A 
C) 0.63 A 
D) -1.4 A

Exam 18: Direct-Current Circuits

An 8.00-Ω resistor is connected to a battery with internal resistance of 0.200 Ω.If the terminal voltage across the battery is 9.00 V,what is the battery's emf?

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 loop rule for a clockwise loop around the perimeter of the circuit?

How much power is being dissipated by one of the 10-Ω resistors?

Which voltage is not caused by a source of emf?

Which resistor is in series with resistor R?

Kirchhoff's rules are the junction rule and the loop rule.Which of the following statements is true?

Three resistors,with values of 3.00,7.00,and 15.0 Ω,respectively,are connected in parallel.What is the overall resistance of this combination?

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

A certain capacitor is charged to 10 V and then,at t = 0,allowed to discharge through a certain resistor.There will be a certain time before the voltage across the capacitor reaches 5 V.This time can be decreased for this circuit by increasing:

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?

In applications where electrical shocks may be more likely,such as around water in kitchens and bathrooms,special outlets called GFI's are used.What does GFI stand for?

When a light bulb is turned on,its resistance increases until it reaches operating temperature.What happens to the current in the bulb as it is warming up?

The ammeter shown in the figure reads 4.4 A,R1 = 7.0 Ω,R2 = 5.0 Ω,and R3 = 2.0 Ω. -What is I2?

What is the maximum number of 60-W light bulbs you can connect in parallel in a 100-V home circuit without tripping the 30-A circuit breaker?

The ammeter shown in the figure reads 4.4 A,R1 = 7.0 Ω,R2 = 5.0 Ω,and R3 = 2.0 Ω. -What is I1?

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Filters

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 loop rule for a clockwise loop around the perimeter of the circuit?

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

The ammeter shown in the figure reads 4.4 A,R₁ = 7.0 Ω,R₂ = 5.0 Ω,and R₃ = 2.0 Ω. -What is I₂?

The ammeter shown in the figure reads 4.4 A,R₁ = 7.0 Ω,R₂ = 5.0 Ω,and R₃ = 2.0 Ω. -What is I₁?