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Confussing Loading Computation

Guest urbanmiles

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Guest urbanmiles

Hi Everyone , i have this simple setup of mine and i want to know how can i compute the total loading of this setup:

the siren is rated 12V 15W and i connected it with a 12V 1A Adapter and it works just fine .

i know that P=IV then I=P/V

but im confused if the siren is really consuming 15W knowing that the adapter is only generating 12V x 1A =12Watts, right ?

and from the rating given, 12V 15W, so here the current must be 15/12 = 1.25A , but the adapter is giving only 1A,

how can i compute for the correct wattage and current consumed by the siren when connected with a 12v 1A adapter? tnx!


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