ISCET - International Society of Certified Electronics Technicians DC Circuit Analysis Questions and Answers

Question 1

In a simple DC series circuit containing a 12V battery and three resistors (R1=10Ω, R2=20Ω, R3=30Ω), what is the total power dissipated by the circuit?

Accepted Answer

2.4 W

Answer

4.8 W

Answer

7.2 W

Answer

12.0 W

Question 2

According to Kirchhoff's Voltage Law (KVL), which of the following statements is true for any closed loop in a DC circuit?

Accepted Answer

The algebraic sum of all voltages around the loop is equal to zero.

Answer

The algebraic sum of the currents entering and leaving a node is zero.

Answer

The total resistance is the sum of individual resistances.

Answer

The voltage across any component is proportional to the current through it.

Question 3

A technician needs to simplify a complex linear DC circuit with multiple sources and resistors into a single voltage source in series with a single resistor. Which of the following theorems should be applied?

Accepted Answer

Thevenin's Theorem

Answer

Norton's Theorem

Answer

Superposition Theorem

Answer

Ohm's Law

Question 4

In the analysis of a series-parallel circuit, what is the first step in determining the total equivalent resistance?

Accepted Answer

Identify and calculate the equivalent resistance of the simple parallel combinations.

Answer

Calculate the total current flowing from the source.

Answer

Apply Kirchhoff's Voltage Law to the main loop.

Answer

Measure the voltage drop across the series resistors.

Question 5

A circuit has a total current of 5A flowing into a junction that splits into two parallel branches. If one branch has a resistance of 10Ω and the other has a resistance of 15Ω, how much current flows through the 10Ω resistor?

Accepted Answer

3 A

Answer

2 A

Answer

5 A

Answer

2.5 A

Question 6

What does Norton's Theorem state about a linear DC circuit?

Accepted Answer

It can be replaced by an equivalent circuit with a single current source and a parallel resistor.

Answer

It can be replaced by an equivalent circuit with a single voltage source and a series resistor.

Answer

The total power is the sum of the power dissipated in each component.

Answer

The current is directly proportional to the voltage and inversely proportional to the resistance.