which best contrasts electric doorbells and audio speakers?\ndoorbells involve rapid changes in the…

which best contrasts electric doorbells and audio speakers?\ndoorbells involve rapid changes in the direction of current, and speakers do not.\nspeakers involve rapid changes in the direction of current, and doorbells do not.\ndoorbells require closed circuits in order to work, and speakers do not.\nspeakers require closed circuits in order to work, and doorbells do not.

which best contrasts electric doorbells and audio speakers?\ndoorbells involve rapid changes in the direction of current, and speakers do not.\nspeakers involve rapid changes in the direction of current, and doorbells do not.\ndoorbells require closed circuits in order to work, and speakers do not.\nspeakers require closed circuits in order to work, and doorbells do not.

Answer

Brief Explanations:

Speakers convert electrical signals (which involve rapid - changing current) into sound. Doorbells work by a simple on - off current flow to create a mechanical sound, not involving rapid current direction changes like speakers. Both need closed circuits to function.

Answer:

Speakers involve rapid changes in the direction of current, and doorbells do not.