A. 138 Ω

**B. 1,389 Ω**

C. 5,700 Ω

D. 880 Ω

# Series-parallel Circuits

## Two 3.3 kΩ resistors are in series and this series combination is in parallel with a 4.7 kΩ resistor. The voltage across one of the 3.3 kΩ resistors is 12 V. The voltage across the 4.7 kΩ resistor is_________?

**A. 24 V**

B. 12 V

C. 0 V

D. 6 V

## In a series–parallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2‘s voltage will:___________?

A. increase

B. remain the same

**C. decrease**

D. cannot tell

## When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read_____________?

A. twice the source voltage

B. half the source voltage

**C. zero volts**

D. the same as the source voltage

## A voltage divider consists of two 68 kΩ resistors and a 24 V source. The unknown output voltage is______________?

**A. 12 V**

B. 24 V

C. 0 V

D. 6 V

## The parallel combination of a 470 Ω resistor and a 680 Ω resistor is in series with the parallel combination of four 2 kΩ resistors. The total resistance is___________?

A. 1,650 Ω

B. 1,078 Ω

C. 77.8 Ω

**D. 778 Ω**

## The internal resistance of a 20,000 ohm/volt voltmeter set on its 5 V range is_____________?

A. 20,000 Ω

**B. 100,000 Ω**

C. 200,000 Ω

D. 1,000,000 Ω

## The first goal to accomplish in analyzing a complex series-parallel circuit is to____________?

A. solve for all the voltage drops

**B. solve for the total current and resistance**

C. equate all series components

D. equate all parallel components

## A certain Wheatstone bridge has the following resistor values: R1 = 10 kΩ, R2 = 720 Ω, and R4 = 2.4 kΩ. The unknown resistance is_____________?

A. 24 Ω

B. 2.4 Ω

C. 300 Ω

**D. 3,000 Ω**

## Three 10 kΩ resistors are connected in series. A 20 kΩ resistor is connected in parallel across one of the 10 kΩ resistors. The voltage source is 24 V. The total current in the circuit is___________?

**A. 900 μA**

B. 9 mA

C. 90 mA

D. 800 μA