electrical

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Anonymous Poster	electrical 09/29/2009 5:47 AM
	How long a 1000w bulb will glow from a 200Amp battery? Is there any formula to culculate the time. Will there be any effect on time if I use a 1000w motor instead of bulb
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Anonymous Poster	#1 Re: electrical 09/29/2009 5:56 AM
	This is not the place for your homework questions. Learn it on your own.
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user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#2 Re: electrical 09/29/2009 6:55 AM
	A '200Amp battery' is a meaningless statement. Batter capacity is measured in AH (amphours) or mAh (milliamphours) 1000w=1000w, but once a bulb ceases to glow white hot it will draw more that 1000w as it's resistance will decrease. __________________ health warning: These posts may contain traces of nut.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#4 In reply to #2 Re: electrical 09/29/2009 8:27 AM
	199 ?
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SimpleMind Guru Join Date: Sep 2009 Posts: 1056 Good Answers: 88	#8 In reply to #2 Re: electrical 10/03/2009 3:27 PM
	Caught you Del.. Filament resistance will of cource decrease but no power increase there: V decreases, I also decreases but at a much lower rate because of the filament decreasing temp. __________________ Life is complex. It has a real part and an imaginary part.
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mjb1962853 Guru Join Date: Jan 2008 Location: NY Posts: 1207 Good Answers: 119	#3 Re: electrical 09/29/2009 7:37 AM
	You need to know the battery capacity in [Amp-Hours ]...AND the battery voltage to answer your question.
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#5 Re: electrical 09/29/2009 2:21 PM
	This does look like a homework question, especially since a 1000W bulb and 200AH battery (12V standard or 2V solar) is not the sort of thing you find around the house. Why don't teachers teach more practical examples, this scales so easily to 12V 100W bulb, 12V 20AH battery + ohms law = answer. Hang on hasn't this exact same question been asked atleast once (possibly twice) before on CR4. __________________ jack of all trades
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Sapper Power-User Join Date: Dec 2007 Location: Sydney Australia Posts: 480 Good Answers: 35	#6 In reply to #5 Re: electrical 10/01/2009 4:09 AM
	Nope, your imaginationing it.... cause they used different figures last time.. I've actually started to see a pattern in these H\W questions. At the same time each semester (about every 6months) there are a flurry of H\W questions...they thin out as you get to the next mid-year assessment and then starts again at the next intake... Just a thought.. Regards, Sapper __________________ It's all about the Boom! - MythBusters
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#7 In reply to #6 Re: electrical 10/01/2009 2:20 PM
	At the same time each semester (about every 6months) there are a flurry of H\W questions...they thin out as you get to the next mid-year assessment and then starts again at the next intake... If you look at previous threads on CR4 you can sometimes find the exact same questions. There was also one or two questions recently that looked like they came from two different students taking the same class in the same semester. Still the old adage "have you checked the manual" translates well to the classroom "have you checked the back of your text book" (or at the very least paid attention in class). __________________ jack of all trades
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Anonymous Poster (1); jack of all trades (2); lyn (1); mjb1962853 (1); Sapper (1); SimpleMind (1); user-deleted-1105 (1)

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