Biology

Carlee Kaiser

17 April, 04:35

Which best contrasts electric doorbells and audio speakers?

a. Doorbells involve rapid changes in the direction of current, and speakers do not. b. Speakers involve rapid changes in the direction of current, and doorbells do not. c. Doorbells require closed circuits in order to work, and speakers do not.

d. Speakers require closed circuits in order to work, and doorbells do not.

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