- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
What would happen if you installed a doorbell transformer, for example, and fed it with 120V DC ?
Saturate and go on fire.What would happen if you installed a doorbell transformer, for example, and fed it with 120V DC ?
10 car batteries, for instanceWhere would you get 120v DC?
Therefore at DC they are unprotected. Not much output either. One pulse when you first connect it.Doorbell transformers are protected from overload by impedance, but not by resistance.
Doorbell transformers are protected from overload by impedance, but not by resistance.
Don't try it at home...........This is not a trick question and I have no idea where this thought came from but I wondered whether the trany would notice the difference if DC was injected in it.
I would have to say that, like any other transformer subjected to DC at their rated 60Hz voltage, it would emit hypothetical magic smoke.This is not a trick question and I have no idea where this thought came from but I wondered whether the trany would notice the difference if DC was injected in it.
Someone asked where would you get 120V DC -- that doesn't matter as it is hypothetical
This is not a trick question and I have no idea where this thought came from but I wondered whether the trany would notice the difference if DC was injected in it.
Someone asked where would you get 120V DC -- that doesn't matter as it is hypothetical
The transformer can only convert from 120 VAC to (for instance) 24 VAC. Transformers can't be used to convert DC voltage. Tesla discovered that a couple years before I was born.
Putting DC on a coil makes it into an electromagnet. There is no expanding and collapsing magnetic field like there is in AC, and that is needed to induce current into the secondary coil.
Break the current in an inductive circuit and you create a high voltage transient - e=Ldi/dt. Few primary turns and many secondary turns and you get enough volts for a spark plug spark.Pulsating DC works like AC on transformers. That's how automobile coils work. Make and break produces the required magnetic field movement in this case.
Not really. Transformers need both positive an negative half cycles to reset the flux. Pulsing DC doesn't do that.So hypothetically, you could use DC pulsating at 60hz with about a 70 percent duty cycle and the doorbell would hypothetically work just fine.
a small Detour: Would you get 120V out from this setup: X former 120V in, 24V out, 2nd Xformer 24V in, 120V out ???
Yes but why do it?a small Detour: Would you get 120V out from this setup: X former 120V in, 24V out, 2nd Xformer 24V in, 120V out ???