ALTERNATE CURRENT Meaning and
Definition
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Alternate current (AC) refers to an electrical current that periodically changes its direction, typically oscillating at a certain frequency. This type of current is characterized by a symmetric waveform that alternates between positive and negative values. Unlike direct current (DC), which flows only in one direction, AC reverses its polarity regularly, resulting in rapid changes in the direction of electron flow.
AC is commonly used in most electrical power transmission and distribution systems worldwide due to its numerous advantages. One major benefit is its ability to be easily transformed to different voltage levels using transformers, enabling efficient transmission over long distances. AC can also be generated by alternating current generators, wherein the direction of the current is continuously switched. Moreover, AC is considered safer for humans compared to DC, as its periodic changes allow for safer, reduced voltage levels to be delivered to homes and buildings.
AC is expressed using various parameters, including its frequency, which measures the number of complete cycles per second (Hertz, Hz), and its amplitude, representing the peak value of the waveform, often measured in volts. Common examples of AC sources include power stations, electric generators, and outlets in homes and businesses.
Overall, alternate current serves as a fundamental concept in electrical engineering and plays a vital role in the distribution, generation, and utilization of electrical power.
Etymology of ALTERNATE CURRENT
The term "alternate current" is a misinterpretation and is not commonly used in reference to electric current. However, if you meant "alternating current", here is the etymology:
The term "alternating current" is derived from the Latin word "alternātus", meaning "turned by turns" or "alternated". It is a combination of the prefix "alter", meaning "the other", and the suffix "-ātus", denoting a state or action.
The concept of alternating current in electricity was developed by Nikola Tesla and popularized in the late 19th century. The term was likely coined to describe the flow of electric current that continuously changes direction, oscillating back and forth. This is in contrast to direct current (DC), which flows continuously in one direction.
