Guest urbanmiles Posted August 12, 2014 Report Share Posted August 12, 2014 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/Vbut 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! Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 12, 2014 Report Share Posted August 12, 2014 If the speaker part is 8 ohms and the siren circuit gives it a squarewave of plus and minus 5.5V over and over then the power in the speaker is (11V squared)/8 ohms= 15.1W for half the time which is an average power of only 7.5W.Maybe the siren's power rating is its (fake) peak power of 15.1W. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.