alleryA loudspeaker uses a magnet and a coil to change an electrical signal into what?
AThermal energy
BNuclear energy
CChemical energy
DMechanical energy
Answer & Solution
Correct answer: D. Mechanical energy
1. The coil carries the signal as changing current.
2. It feels a force from the permanent magnet and moves the cone.
3. The moving cone makes sound, so electric energy becomes mechanical energy.
_Source: Wikipedia, Magnet, Common uses_
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