Elenco Electronics AM/FM-108TK Assembly And Instruction Manual page 15

Vp = Vclp/2
Vrms = Vp x .7
Max power out = (Vrms)
Since the battery power equals the battery voltage times the current taken from the battery; calculate the battery
power:
Battery power = Imax x V supply
Since the efficiency (N) is equal to the Max power out divided by the Battery power, we can now calculate the
efficiency of the audio amplifier.
N = Max power out/Battery power
N in % = N x 100
Your calculated answer should be around .6 or 60%.
Generator
Hz
TP15
TP15
/8
2
If you do not have a power supply, use a 9
volt battery instead.
Power Supply
Figure 11
Vp = ______
Vrms = ______
Max power out = ______
Battery power = ______
N = _______
N = _______%
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Amps
Amps COM
TP15