AC flips polarity very often. Most semiconductor devices have been designed with very particular polarity conditions in mind. If one were to reverse the polarity between two inputs on many different components, you would get magic smoke coming out of it.
Many electronics circuits do have signals with AC components to them, but they usually have a DC offset to them to prevent the polarity switching. That would be something like 5VppAC with a 2.5V DC offset would be an AC signal from 0-5 V. That remains the same polarity at all times even though it's passing an AC signal.
Many electronics circuits do have signals with AC components to them, but they usually have a DC offset to them to prevent the polarity switching. That would be something like 5VppAC with a 2.5V DC offset would be an AC signal from 0-5 V. That remains the same polarity at all times even though it's passing an AC signal.
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