What is the turns ratio of a transformer used to match an audio amplifier having 600 ohm output impedance to a speaker having 4 ohm impedance? [G5C07]
A. 12.2 to 1
B. 24.4 to 1
C. 150 to 1
D. 300 to 1
This is a simple ratio type equation, almost. The equation for solving this problem looks like this:
Where N is the number of turns, p and s are primary and secondary respectively, and Z is impedance. If we substitute our numbers, we get
So our answer becomes: A. 12.2 to 1. Note that if we had flipped the values in the equation, we would have wound up with exactly the same value, only inverted, that is, 1 to 12.2.