ac and dc

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Anonymous Poster	ac and dc 04/12/2009 5:32 PM
	hi all i know its basic but i dont understand how it works! can some one please tell me why on dc voltage we can not use transformer while we can do it on AC ? sorry for this stupid question but this is me! i do not know it? thanks
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TheCanadianBear Active Contributor Join Date: Sep 2008 Location: Nova Scotia, Canada "Canada's Ocean Playground" Posts: 20	#1 Re: ac and dc 04/12/2009 6:54 PM
	You should brush up on the basics of magnetisim, a transformer is basically two electro magnets coupled by an iron core. __________________ TheCanadianBear
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CraziestOzzy Power-User Join Date: Apr 2009 Location: Australia, sunny North Queensland Posts: 380 Good Answers: 12	#2 Re: ac and dc 04/12/2009 7:37 PM
	...actually was a challenge to find something suitable to help you. All booked up and still with no understanding of what is really simple: been there myself. Check this LINK out. The entire page describes everything you will need to know. Especially in answering why DC applied to a coil heats up the wire and AC applied to a coil acts very differently. I tried to steer away from web sites that had too much theory and crap diagrams and did not answer your question directly. You will need to understand words such as inductance, resistance, magnetism, current etc. to get a handle as to what is actually happening behind the scenes with a transformer. This whole page given in the link above describes these things and other internal links are worth a look. It would be impossible to answer your question concisely in one sentence and a link to another website was in my view needed. Some people use analogies of water in a hose and I think the description is good for DC but not very applicable for AC in providing a clear understanding with regards to transformers/coils etc.. Actually was good reading for me too __________________ CraziestOzzy
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sb Guru Join Date: Mar 2007 Posts: 2550 Good Answers: 103	#3 Re: ac and dc 04/12/2009 10:21 PM
	It is very simple You must have learnt- a *changing* magnetic field intuces an electric field (or current). The DC do not have this changing magnetic field (at least when it is stabilised, you have a bit on the switch on) - hence no induced electric field and hence no transformer action. In other way also this is explained - when a conductor cuts flux lines Or A conductor (like the mechanical momentum) tries to retain its magnetic state- so when a magnetic field is applied on it it tries to resist it by passing a current which resists the applied field- but when it is a constant field, then (like a constant velocity in no-friction- so no force) __________________ Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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You might be interested in: AC-DC Adapters, DC to AC Converter Chips, DC-AC Inverters

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