Physics for IGCSE & O level - Magnets And Currents (Section 8 - No. 37)
In a moving-coil loudspeaker, what type of current does the amplifier send to the coil?
Direct current (DC).
Alternating current (AC).
Static current.
A constant current.
คำอธิบาย
The amplifier sends alternating current to the coil.