what you mean byAlternating current ?

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In electricity, alternating current (AC) occurs when charge carriers in a conductor or semiconductorperiodically reverse their direction of movement. Household utility current in most countries is AC with a frequencyof 60 hertz (60 complete cycles per second), although in some countries it is 50 Hz....
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In electricity, alternating current (AC) occurs when charge carriers in a conductor orsemiconductorperiodically reverse their direction of movement. Household utility current in most countries is AC with afrequencyof 60hertz(60 complete cycles per second), although in some countries it is 50 Hz. The radio-frequency (RF) current in antennas and transmission lines is another example of AC. read less
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A current which changes its polarity and direction over time is known as alternating current. An alternating current has varing magnetic flux.
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In electricity, alternating current (AC) occurs when charge carriers in a conductor or semiconductorperiodically reverse their direction of movement. Household utility current in most countries is AC with a frequencyof 60 hertz (60 complete cycles per second), although in some countries it is 50 Hz....
read more
In electricity, alternating current (AC) occurs when charge carriers in a conductor orsemiconductorperiodically reverse their direction of movement. Household utility current in most countries is AC with afrequencyof 60hertz(60 complete cycles per second), although in some countries it is 50 Hz. The radio-frequency (RF) current in antennas and transmission lines is another example of AC. read less
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Alternative current occurs.... change of sign periodically ( possitive and negative)... Possitive consider it as on and negative consider it as off.... But we can't observe practically .. because of frequency of AC current is 50Hz to 60Hz..
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