A: The AC line 60 hz constantly goes to zero every 8.33 milliseconds
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i think average value of current in ac current is zero.
no actually dc current is more dangerous than ac because dc is a direct current and has no current zero condition ,which is very dangerous and do not leave us if we get shock while ac current leave us when we get shock
You can block AC current by using a filter with a pass-band that is outside the frequency of the AC current.
A "Rectifier" converts AC current to pulsating DC current.
One is sinusoidal through the zero point i.e. alternating current, the other would be a flat line at whatever the current value was i.e. direct current