test review Flashcards
E.L.I. means what?
voltage leads current
In a transformer power out equals what?
power in
transformers only work with…..
AC voltage
Why is the core laminated
to reduce interference
laminated iron core reduces what
eddy loss
primary current lags voltage by ?
secondary current lags voltage by?
what does this make?
90 degrees
90 degrees
sine wave
what are the two parts of the solenoid
coil and plunger
define solenoid
does mechanical work
what does SPST, SPDT, DPST, DPDT mean
single pull single throw
sinagle pull double throw
double pull single throw
double pull double throw
what is the only moveable part in a relay
armature
what are the two parts of a relay
coil and contacts
what is a relay
an electrically controlled switch
what is the time constance equation
T=L/R
L=inductance
what is the difference between time constance and full time constance and what is it measured in?
full time constance you times by 5
measured in seconds
does voltage hit the inductor or resistor first
inductor
