# Practice Test: Question Set - 03

**1. The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω resistor that makes up part of the parallel circuit is approximately**

- (A) 22 mA

- (B) 120 mA

- (C) 220 mA

- (D) 50 mA

**2. When an open circuit occurs in a parallel branch, the total resistance decreases.**

- (A) True

- (B) False

**3. The currents into a junction flow along two paths. One current is 4 A and the other is 3 A. The total current out of the junction is**

- (A) 1 A

- (B) 7 A

- (C) Unknown

- (D) The larger
of the two

**4. If there are a total of 120 mA into a parallel circuit consisting of three branches, and two of the branch currents are 40 mA and 10 mA, the third branch current is**

- (A) 50 mA

- (B) 70 mA

- (C) 120 mA

- (D) 40 mA

**5. A parallel circuit acts as a current divider.**

- (A) True

- (B) False

**6. Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is**

- (A) 12.5 Ω

- (B) 200 Ω

- (C) 20 KΩ

- (D) 50 Ω

**7. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is**

- (A) 1.2 W

- (B) 4.8 W

- (C) 0.3 W

- (D) 12 W

**8. The total resistance for two resistors in parallel is equal to the sum of the two resistors.**

- (A) True

- (B) False

**9. Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately**

- (A) 2.2 A

- (B) 137 mA

- (C) 1.8 A

- (D) 9.09 A

**10. In a certain three-branch parallel circuit,**

*R*_{1}has 12 mA through it,*R*_{2}has 15 mA through it, and*R*_{3}has 25 mA through it. After measuring a total of 27 mA, you can say that- (A)

*R*

_{3}is open

- (B)

*R*

_{1}is open

- (C)

*R*

_{2}is open

- (D) The circuit
is operating properly

**11. Addition of resistors in parallel increases total resistance and decreases total current.**

- (A) True

- (B) False

**12. The following resistors are in parallel across a voltage source: 220 Ω, 470 Ω, and 560 Ω. The resistor with the least current is**

- (A) 220 Ω

- (B) 470 Ω

- (C) 560 Ω

- (D) Impossible
to determine without knowing the voltage

**13. The number of current paths equals the number of resistors in parallel.**

- (A) True

- (B) False

**14. Three 47 Ω resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately**

- (A) 2.3 A

- (B) 780 mA

- (C) 47 mA

- (D) 7.06 A

**15. Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance**

- (A) Is less than
6 kΩ

- (B) Is greater
than 1.2 kΩ

- (C) Is less than
1.2 kΩ

- (D) Is
less than 600 Ω

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