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Which best contrasts electric doorbells and audio speakers?

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

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Answered by GPT-5 mini AI
Speakers involve rapid changes in the direction of current, and doorbells do not.

Explanation: Speakers are driven by alternating audio signals that reverse direction many times per second to produce vibrations. Doorbells are typically simple on/off circuits that energize a solenoid or striker (no rapid AC reversals). Both require closed circuits to operate.