4.7.3.3 Microphones (HT only)

Spec reference: 4.7.3.3/4.7.3.4 (physics only) (HT only).

Triple-only content in this dot

• Microphone uses generator effect (moving-coil).
• Transformer equations: Vp/Vs = Np/Ns and power relation VpIp = VsIs.

Exam quick-check

• Can I identify this as a triple-only point from wording in the question?
• Can I apply the correct equation/idea with units and a clear conclusion?