Power amplifiers generally use transformer coupling because transformer permits______________?
Correct answer: B. Impedance matching
- A. Cooling of the circuit
- B. Impedance matching
- C. Distortionless output
- D. Good frequency response
Explanation
A transformer reflects the load impedance according to the square of its turns ratio, allowing a speaker or other load to appear at the impedance most suitable for the transistor. This impedance matching is the main reason for transformer coupling in power amplifiers.
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