Ac current MCQ CEE MBBS ENTRANCE , Nepal Entrance Nepal Quiz
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Alternating Current (AC)
Definition
Alternating Current (AC) is an electric current that reverses direction periodically. Unlike direct current (DC), where the flow of electric charge is unidirectional, AC changes its direction at regular intervals, which is typically measured in Hertz (Hz).
Characteristics of AC
- Waveform: AC is commonly represented as a sine wave, though other waveforms like square waves and triangular waves can also occur.
- Frequency: The frequency of AC indicates how many cycles it completes in one second. In Nepal, the standard frequency is 50 Hz.
- Voltage Levels: AC can be transformed to different voltage levels using transformers, making it suitable for long-distance power transmission.
Applications of AC
AC is widely used in power systems for residential, commercial, and industrial applications due to its efficient transmission over long distances. Household appliances such as refrigerators, air conditioners, and lighting systems typically operate on AC power.
Advantages of AC
- Efficient for power distribution over long distances.
- Can be easily transformed to different voltage levels.
- Most electrical appliances are designed to operate on AC.
Conclusion
Understanding AC is crucial for students studying electrical engineering and physics, as it forms the basis of most modern electrical systems.
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