Multiple Choice
In an alternating current (AC) circuit, what does the frequency of the current represent?
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31. Alternating Current
Alternating Voltages and Currents
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Which of the following devices is a source of alternating current (AC)?
A
A wall outlet connected to an AC generator in a power station
B
A DC power supply set to a constant voltage
C
A battery
D
A photovoltaic (solar) cell in steady sunlight
Verified step by step guidance1
Understand the difference between alternating current (AC) and direct current (DC). AC current periodically reverses direction, while DC current flows in only one direction.
Identify the nature of each device listed: a wall outlet, a DC power supply, a battery, and a photovoltaic cell.
Recall that a wall outlet is connected to the power grid, which is supplied by AC generators in power stations. These generators produce current that changes direction periodically.
Recognize that a DC power supply, a battery, and a photovoltaic cell provide direct current, meaning the current flows steadily in one direction without reversing.
Conclude that the device which is a source of alternating current (AC) is the wall outlet connected to an AC generator in a power station.
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