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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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26th August 2008, 11:52 AM
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 Electronics homework question :) Hi there can anyone understand this? answer? explain? calculations? question is The DC current draw of a 24v inverter supplying a 240volt, 5 amp load. Assume an inverter effeciency of 90% thanks  | |
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26th August 2008, 12:08 PM
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You calculate the output power, apply the 90% eff then use that to calc the input current at 24V..
__________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 26th August 2008 at 12:08 PM. | ||
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26th August 2008, 12:51 PM
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I think the question is poorly written, my college professors did this a lot as well. Rephrase: Find the DC current draw of a 24V inverter with 90% efficiency under a 240V, 5A load. Hint: √2 (I would not give this hint on an exam or homework or quiz what so ever )I'm not a native English speaker but I think my rephrased version is more understandable.
__________________ transistance is futile... Last edited by transistance; 26th August 2008 at 08:43 PM. | ||
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26th August 2008, 06:16 PM
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| Hint: You shouldn't need √2.
__________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez | |
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26th August 2008, 08:42 PM
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| squashed...
__________________ transistance is futile... | |
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26th August 2008, 08:45 PM
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| Eric is correct.
__________________ "Remember, you're special.....just like everyone else." | |
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26th August 2008, 08:52 PM
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| I suppose it could be 45A
__________________ There are two major products that came out of Berkeley: LSD and BSD. We don't believe this to be a coincidence. —Jeremy S. Anderson | |
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26th August 2008, 09:27 PM
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 Quote:
 the answer is supposed to be 55A! Muhammad89
__________________ When you Teach, You Learn Twice! | ||
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26th August 2008, 10:13 PM
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ooopss, my mistake 
__________________ There are two major products that came out of Berkeley: LSD and BSD. We don't believe this to be a coincidence. —Jeremy S. Anderson | ||
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26th August 2008, 11:17 PM
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Thanks DMW for catching my mistake.
__________________ "Remember, you're special.....just like everyone else." Last edited by rezer; 27th August 2008 at 04:59 AM. | ||
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27th August 2008, 03:06 AM
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| actually its 55.555 you have to go from 100% back down to 90%, which means adding 10% wont work, you need to go 240 * 5 = 1200 1200 / 0.9 = 1333.33' 1333.33' / 24 = 55.55' | |
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