ISCET DC Circuit Analysis 5

Question 1

What is the conductance of a 25Ω resistor?

Accepted Answer

0.04 S

Answer

Conductance G = 1/R = 1/25 = 0.04 siemens (S).

Question 2

A circuit has nodes A, B, and C. Using node voltage analysis, how many independent node equations are needed if C is the reference node?

Accepted Answer

2

Answer

With 3 nodes and 1 reference, you need 3 − 1 = 2 independent node voltage equations.

Question 3

Two 6V batteries are connected series-opposing in a loop with a 3Ω resistor. What current flows?

Accepted Answer

0A

Answer

Series-opposing batteries cancel each other: net EMF = 6 − 6 = 0V, so current = 0A.

Question 4

The voltage across an open circuit in a DC network is:

Accepted Answer

Equal to the Thevenin voltage

Answer

The open-circuit voltage is precisely Vth because no current flows through the Thevenin resistance, causing no drop.

Question 5

A 5A current source has a 20Ω resistor in parallel. What is the open-circuit voltage across the terminals?

Accepted Answer

100V

Answer

Voc = IN × RN = 5A × 20Ω = 100V.

(ISCET) International Society of Certified Electronics Technicians Practice Test