In Fig. 31-35, let the rectangular box on the left
Chapter , Problem 66(choose chapter or problem)
In Fig. 31-35, let the rectangular box on the left represent the (high-impedance) output of an audio amplifier, with r ! 1000 ". Let R ! 10 " represent the (low-impedance) coil of a loudspeaker. For maximum transfer of energy to the load R we must have R ! r, and that is not true in this case. However, a transformer can be used to transform resistances, making them behave electrically as if they were larger or smaller than they actually are. (a) Sketch the primary and secondary coils of a transformer that can be introduced between the amplifier and the speaker in Fig. 31-35 to match the impedances. (b) What must be the turns ratio?
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