M
Mark
Suppose I have a transformer such that the primary current is Ip when the
secondary current is Is, if I flip a switch on the secondary , the Is'
then is 0. I know that if you do this, the primary current does go
down but it doesn't go to 0 amps. In fact this is obviously so because
a transformer will remain warm even if the secondary is disconnected.
Is there a general equation that will estimate that or is it just something
you have to measure on the bench for each transformer? I'm
just wondering a bit about how much my various wallwarts waste when
the thing they go to are turned off.
thanks,
Mark
secondary current is Is, if I flip a switch on the secondary , the Is'
then is 0. I know that if you do this, the primary current does go
down but it doesn't go to 0 amps. In fact this is obviously so because
a transformer will remain warm even if the secondary is disconnected.
Is there a general equation that will estimate that or is it just something
you have to measure on the bench for each transformer? I'm
just wondering a bit about how much my various wallwarts waste when
the thing they go to are turned off.
thanks,
Mark