ISCET DC Circuit Analysis 2

Question 1

Three resistors of 6Ω, 12Ω, and 4Ω are connected in parallel. What is the equivalent resistance?

Accepted Answer

2Ω

Answer

1/Req = 1/6 + 1/12 + 1/4 = 2/12 + 1/12 + 3/12 = 6/12, so Req = 2Ω.

Question 2

A 24V battery is connected to a 6Ω and 2Ω resistor in series. What is the voltage drop across the 6Ω resistor?

Accepted Answer

18V

Answer

Total resistance is 8Ω; current = 24/8 = 3A; V = 3A × 6Ω = 18V.

Question 3

What happens to the total current in a parallel circuit when an additional branch is added?

Accepted Answer

Total current increases

Answer

Adding a branch lowers equivalent resistance, so total current from the source increases.

Question 4

A 100Ω resistor and a 900Ω resistor form a voltage divider across 10V. What is the voltage across the 100Ω resistor?

Accepted Answer

1V

Answer

V = 10V × (100/1000) = 1V using the voltage divider formula.

Question 5

Using Kirchhoff's Voltage Law, the algebraic sum of all voltages around any closed loop equals:

Accepted Answer

Zero

Answer

KVL states that the sum of all EMFs and voltage drops around any closed loop must equal zero.

(ISCET) International Society of Certified Electronics Technicians Practice Test