EIT Electrical Circuits

Question 1

According to Ohm's Law, what is the current through a 10Ω resistor with 20V across it?

Accepted Answer

2 A

Answer

Ohm's Law: I = V/R = 20/10 = 2 A.

Question 2

What is the total resistance of three 6Ω resistors connected in parallel?

Accepted Answer

2 Ω

Answer

For n equal resistors in parallel: R_total = R/n = 6/3 = 2 Ω.

Question 3

Kirchhoff's Current Law (KCL) states that:

Accepted Answer

Current entering a node equals current leaving the node

Answer

KCL is a statement of charge conservation: the algebraic sum of currents at any node equals zero.

Question 4

What is the impedance of a 100Ω resistor in series with a capacitive reactance of 100Ω?

Accepted Answer

141.4 Ω

Answer

Z = √(R² + Xc²) = √(100² + 100²) = √20000 ≈ 141.4 Ω.

Question 5

The power factor of a purely resistive circuit is:

Accepted Answer

1

Answer

A purely resistive circuit has voltage and current in phase, giving a power factor of cos(0°) = 1.

EIT - Engineering in Training Practice Test