Questions: What does electricity cause in speakers to make a sound? A. Vibration B. Rotation C. Heat D. Light

△ What does electricity cause in speakers to make a sound? ○ Understanding how speakers work ☼ Speakers convert electrical energy into sound energy. When an electrical current flows through the speaker's voice coil (which is essentially a wire wrapped around a magnet), it creates a magnetic field. This magnetic field interacts with a permanent magnet in the speaker, causing the voice coil to move. ○ The physical mechanism of sound production ☼ The movement of the voice coil causes the speaker cone (diaphragm) to move back and forth. This back-and-forth movement is a vibration that pushes and pulls on the surrounding air molecules, creating sound waves that travel to our ears. The pattern of electrical signals determines the pattern of vibrations, which in turn determines the sound we hear. ○ Analyzing the answer choices ☼ A. Vibration - This is correct. Electricity causes the speaker components to vibrate, which creates sound waves. B. Rotation - While motors rotate due to electricity, speakers don't primarily use rotational motion to produce sound. C. Heat - Although speakers can generate heat as a byproduct, heat is not what creates the sound. D. Light - Speakers don't typically produce light as part of their sound-generating function. ✧ \(\boxed{\text{The answer is A. Vibration}}\)

☺ \(\boxed{\text{The answer is A. Vibration}}\)