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Another transformer question... ( trivia question)
Posted: Sun Mar 01, 2015 7:39 pm
by dacflyer
i am trying to figure the secondary current for a transformer question i have to solve. ( trivia question )
it shows primary 120v with 1 amp load.
secondary is 12.6 - 0 - 12.6 (center tapped) what is the total of the 2 secondary currents ?
i cannot figure it out..
Re: Another transformer question... ( trivia question)
Posted: Sun Mar 01, 2015 8:37 pm
by sghioto
120 volts X 1 amp = 120 watts
12.6 + 12.6 = 25.2 volts
120w / 25.2v = 4.76 amps
Steve G
Re: Another transformer question... ( trivia question)
Posted: Mon Mar 02, 2015 4:44 am
by dacflyer
cool, then i did get it right 1st time,,, i was not sure of myself, thanks...
was not sure of the way to do the math.
Re: Another transformer question... ( trivia question)
Posted: Mon Mar 02, 2015 8:14 am
by Robert Reed
Should be looked at as VA and not watts. Is the secondary load pure AC or DC? If DC with capacitor input filter, the load current will have to be reduced quite a bit. Worst case is with full wave bridges and depending on the setup could reduce allowable current to 50% as compared to a pure AC load.
Re: Another transformer question... ( trivia question)
Posted: Mon Mar 02, 2015 11:39 am
by dacflyer
secondary is just AC straight out of the transformer.
Re: Another transformer question... ( trivia question)
Posted: Mon Mar 02, 2015 2:29 pm
by sghioto
Should be looked at as VA and not watts.
I think in this case since dac mentioned it was just a trivia question we can define it as a pure AC load with 100% efficiency.
Steve G
Re: Another transformer question... ( trivia question)
Posted: Mon Mar 02, 2015 4:15 pm
by Robert Reed
AC- looks like you are good to go. And especially, if its just sine wave to sine wave, VA will hardly be a factor.