CEA Electrical Theory & Fundamentals 2

Question 1

A 120V circuit has a resistance of 40 ohms. What is the power dissipated?

Accepted Answer

360 W

Answer

Power = V²/R = 120²/40 = 14400/40 = 360 W.

Question 2

Which material is considered the best conductor of electricity?

Accepted Answer

Silver

Answer

Silver has the highest electrical conductivity of all metals, though copper is more commonly used due to cost.

Question 3

In a parallel circuit with three 60-ohm resistors, what is the total resistance?

Accepted Answer

20 Ω

Answer

For equal resistors in parallel, total resistance = R/n = 60/3 = 20 Ω.

Question 4

What happens to current flow when temperature increases in a copper conductor?

Accepted Answer

Current decreases

Answer

As temperature rises, resistance of copper increases, which reduces current flow for a given voltage.

Question 5

Kirchhoff's Current Law (KCL) states that:

Accepted Answer

The sum of currents entering a node equals the sum leaving

Answer

KCL states that the algebraic sum of all currents at a node is zero — what enters must leave.

(CEA) Certified Electrical Apprentice Practice Test