**DC Circuits Multiple Choice Questions**

**Question 1**

**Determine the voltage dropped across resistor R3 in this circuit:**

(A) 7.5 volts

(B) 3.0 volts

(C) 6.6 volts

(D) 15 volts

(E) 5.4 volts

**Answer : B**

**Question 2**

**Calculate total current in this circuit:**

(A) 8.000 mA

(B) 7.835 mA

(C) 8.168 mA

(D) 493.8 µA

(E) 5.333 mA

**Answer : B**

**Question 3**

**Calculate the necessary resistor value (R) to balance this bridge circuit:**

(A) 7.299 kΩ

(B) 6.464 kΩ

(C) 9.656 kΩ

(D) 8.501 kΩ

(E) 5.830 kΩ

**Answer : C**

**Question 4**

**Calculate the necessary resistor size for R1 to make the total circuit current equal to 30 milliamps:**

(A) 2.143 kΩ

(B) 1.500 kΩ

(C) 967.7 Ω

(D) 666.7 Ω

(E) 310.0 Ω

**Answer : A**

**Question 5**

**Calculate the current through resistor R4 in this circuit:**

(A) 1.226 mA

(B) 441.5 µA

(C) 1.668 mA

(D) 4.054 mA

(E) 8.994 mA

**Answer : B**

**Question 6**

**Voltages and currents in an RC or LR time-constant circuit will settle to within 1% of their final value(s) in how many time constants?**

(A) 10

(B) 3

(C) 5

(D) 2

(E) 4

**Answer : C**

**Question 7**

**How much voltage will a DMM register if connected with the red test lead on point B and the black test lead on point D?**

(A) +15 volts

(B) -33 volts

(C) +33 volts

(D) -9 volts

(E) -15 volts

**Answer : A**

**Question 8**

**Calculate the voltage between test point B and ground in this circuit:**

(A) 20 volts

(B) 18 volts

(C) 2 volts

(D) 6 volts

(E) 16 volts

**Answer : E**

**Question 9**

**Determine the magnitude and direction of current through resistor R4 in this circuit:**

(A) 240 mA → (left to right)

(B) 160 mA ← (right to left)

(C) 200 mA → (left to right)

(D) 240 mA ← (right to left)

(E) 160 mA → (left to right)

**Answer : B**

**Question 10**

**Determine the magnitude and polarity of the voltage across resistor R4 in this circuit:**

(A) – 1.0 volt + (negative on left, positive on right)

(B) – 7.0 volts + (negative on left, positive on right)

(C) + 0.5 volts – (positive on left, negative on right)

(D) – 3.5 volts + (negative on left, positive on right)

(E) + 4.0 volts – (positive on left, negative on right)

**Answer : C**

Credits : by Tony R. Kuphaldt