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/diy/ - Do It Yourself

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>> No.1948336 [DELETED]  [View]
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1948336

>>1948320
>>1948320
Assume a constant voltage input, calculate the series equivalent resistance. (Rseries+Rspeaker)
Calculate the current that will flow:
I = V/Rtotal
Use the formula for power
>P = I*Rspeaker
You will see it changes quadratically with the series resistor size.
>5v -> 8 Ohm speaker
>power = 3.15 W
> 5V - 8 Ohm resistor - 8 Ohm speaker
>power = 3.15W/4 = 0.78 W
>5V - 16 Ohms - 8 Ohm speaker
>P ≃ 3.15/9 = 0.35W
>>1948330
You use what you have to use, they are not used for very high power stuff or super fast things. For the same size they offer usually higher resistance.

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