CEA Electrical Theory & Fundamentals 3

Question 1

What is the frequency of standard AC power in the United States?

Accepted Answer

60 Hz

Answer

The US power grid operates at 60 Hz, meaning AC current completes 60 cycles per second.

Question 2

Two resistors of 10 Ω and 15 Ω are connected in series across 50 V. What is the voltage across the 10 Ω resistor?

Accepted Answer

20 V

Answer

Total R = 25 Ω, I = 50/25 = 2 A, V10 = 2 × 10 = 20 V.

Question 3

The opposition to current flow offered by a capacitor is called:

Accepted Answer

Capacitive reactance

Answer

Capacitive reactance (Xc) is the opposition capacitors present to AC current, measured in ohms.

Question 4

If a circuit draws 15 A at 240 V, what is the power consumption in kilowatts?

Accepted Answer

3.6 kW

Answer

P = V × I = 240 × 15 = 3,600 W = 3.6 kW.

Question 5

Which law states that the induced EMF in a conductor is proportional to the rate of change of magnetic flux?

Accepted Answer

Faraday's Law

Answer

Faraday's Law states EMF = -dΦ/dt, meaning induced voltage equals the rate of change of magnetic flux.

(CEA) Certified Electrical Apprentice Practice Test