Practice Problems

Practice Problems#

Problem 1

Answer the following questions about the circuit below.

a. Find \(I_S\).

b. Find the power consumed by \(R_2\).

Problem 2

Find \(R_{EQ}\), \(I_S\), \(P_2\), and \(P_{Total}\) for the following circuit.

Problem 3

Find the equivalent resistance of the following circuit and determine if the fuse rating is high enough.

Problem 4

Determine the appropriately sized resistor so the voltage across the load is 45 V.

Problem 5

For resistors in series, a bigger resistor drops more voltage than a smaller resistor.

(a) True   (b) False

Problem 6

For resistors in series, more current flows through the bigger resistor.

(a) True   (b) False

Problem 7

In a current divider, the greater current always flows through the smaller resistor.

(a) True   (b) False

Problem 8

For resistors in parallel, the equivalent resistance is always less than the smallest resistor.

(a) True   (b) False

Problem 9

What is the purpose of a fuse? Choose all that apply.

  • (a) To keep a circuit from working under normal conditions.

  • (b) To allow a circuit to work under normal conditions.

  • (c) To protect the wiring of a circuit.

  • (d) To break the circuit during excessive currents.

Problem 10

Solve for the unknown parameter(s) in each of the following circuits.

a. Circuit #1

b. Circuit #2

Problem 11

Four 36 Ω light bulbs are connected in parallel to a 9 V battery, as shown. How much power does the battery produce?

Problem 12

A SATCOM control module is modeled as the circuit below. Which of the following are true? Select all that apply.

  • a. \(I_1 = I_2\)

  • b. \(V_2 = V_3\)

  • c. \(I_2 > I_3\)

  • d. \(V_1 + V_3 = V_S\)

Problem 13

The proposed arming circuitry of an experimental munition is modeled as the following resistive circuit. Answer the questions below.

\(R_1 = 600\ \Omega\), \(R_2 = 300\ \Omega\), \(R_4 = 500\ \Omega\)

  • a. What is \(R_{eq}\) as seen by the source \(V_S\)?

  • b. What is the source voltage \(V_S\)?

  • c. How much power is dissipated in \(R_2\)?

  • d. What is the voltage across \(R_4\)?

Problem 14

The circuit below shows a variable power supply capable of providing up to 50 V. Assume each bulb is modeled by a 3 Ω resistor.

  • a. Calculate the maximum voltage setting on the power supply before the fuse blows.

  • b. Calculate the voltage across each light bulb assuming maximum current flow (just before the fuse blows).

Problem 15

The circuit below shows a television represented by a 5 kΩ load requiring 50 V to operate, connected to a 120 V source.

  • a. Given only 2 kΩ and 3 kΩ resistors, how could you create a voltage adapter to make this circuit work?

  • b. Given only 2 kΩ resistors, how could you create a voltage adapter to make this circuit work?