Question
Download Solution PDFIn an electrical circuit, the current that changes periodically, both in magnitude and direction, at regular intervals of time is called ______.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFAlternating current (AC)
In an electrical circuit, the current that changes periodically, both in magnitude and direction, at regular intervals of time is called alternating current.
Direct current (AC)
Direct current (DC) is an electric current that is uni-directional, so the flow of charge is always in the same direction.
Parameters of the sinusoidal wave
1.) Period (T)
The time taken by a sinusoidal wave to complete one complete cycle is known as the period.
2.) Frequency (f)
The number of cycles made by a sinusoidal wave in one second is known as the frequency.
\(f={1\over T}\)
3.) Amplitude
The maximum value of the sinusoidal wave is known as the amplitude.
4.) Resonance
Resonance describes the phenomenon of increased amplitude that occurs when the frequency of an applied periodic force is equal to or close to the natural frequency of the system on which it acts.
5.) Time constant
The time required by the wave to reach 63.7% of maximum amplitude is known as the time constant.
Last updated on Jun 16, 2025
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