DC Electrology Theoryination Vietnamese Exam

DC Electrology Theoryination
Vietnamese Exam
Question 1. Which of the following best defines Direct Current (DC)?


A) Current that reverses direction periodically


B) Current that flows in one direction only


C) Alternating voltage applied to a circuit


D) Current with variable frequency


Answer: B


Explanation: DC is characterized by current that flows steadily in one

direction, unlike AC which reverses direction.




Question 2. What distinguishes DC from AC in terms of flow direction?


A) DC changes direction frequently


B) AC flows in only one direction

,DC Electrology Theoryination
Vietnamese Exam
C) DC flows in a constant direction


D) Both change direction


Answer: C


Explanation: DC flows in a constant direction, while AC alternates

direction periodically.




Question 3. The fundamental unit of electric charge is:


A) Ampere


B) Volt


C) Coulomb


D) Ohm


Answer: C

,DC Electrology Theoryination
Vietnamese Exam
Explanation: The coulomb is the SI unit of electric charge.




Question 4. What is the basic unit of electric current?


A) Ohm


B) Volt


C) Ampere


D) Watt


Answer: C


Explanation: The ampere is the standard unit for measuring electric

current.




Question 5. Which of the following measures electrical potential

difference?

, DC Electrology Theoryination
Vietnamese Exam
A) Watt


B) Ohm


C) Volt


D) Ampere


Answer: C


Explanation: Electrical potential difference is measured in volts.




Question 6. Resistance is measured in:


A) Joules


B) Amperes


C) Volts


D) Ohms