Florida Barber License Practice Test

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What type of electric current flows first in one direction and then in the opposite direction?

Direct current
Alternating current
Static current
Variable current

The correct answer is: Alternating current

The type of electric current that flows first in one direction and then in the opposite direction is known as alternating current (AC). This current is characterized by its periodic reversal of direction, meaning that it changes the flow of electric charge back and forth. This property is fundamental to how many electrical systems and appliances operate, particularly in home and industrial environments where AC is used to power devices. Alternating current is generated by various sources, including power plants and generators, making it the standard form of electricity supplied to homes and businesses. The frequency of this reversal is typically measured in hertz (Hz), with standard electricity in the US operating at a frequency of 60 Hz, which means it alternates 60 times per second. Direct current (DC), on the other hand, flows only in one direction. Static current is not a term typically used in electrical theory concerning flow; it refers to electric charges at rest. Variable current may refer to currents that change in intensity or frequency but does not directly describe the characteristic of flowing in both directions. Therefore, alternating current’s unique property of direction reversal is what defines it as the correct answer.