Impedance matching Example 28.2 showed that maximum power is transferred when the internal resistance of a DC source is equal to the resistance of the load. A transformer may be used to provide maximum power transfer between two AC circuits that have different impedances Z1 and Z2, where 1 and 2 are subscripts and the Z’s are italic (as in the centered equation).
(a) Show that the ratio of turns N1/N2 needed to meet this condition is
(b) Suppose you want to use a transformer as an impedance matching device between an audio amplifier that has an output impedance of 8.00 k Ω and a speaker that has an input impedance of 8.00 (. What should your N1/N2 ratio be?