Test Two Flashcards
How many degrees out of phase will an induced voltage be out of phase with the applied voltage?
180 degrees
What are inductive reactance? How is it created?
Opposition to current flow caused by counter EMF. It is caused through self induction
What does counter EMF(XL) limit in inductive AC circuit?
Current. It is not resistance though
How is XL measured?
It is measured in ohms
What is the equation for XL?
XL=2(3.1416) fL
How do values of inductors add in a series circuit?
They add directly
How do values of inductors add in parallel circuit?
They ad by product/sum and reciprocal method
In a purely inductive circuit what is the voltage and current doing?
It is out of phase and voltage leads current by 90 degrees
What results from true power consumption in a coil?
Losses of eddy currents, and hysterious losses
How is reactive power measured?
It is measured in VARS (Volt amp- Reactive)
What are the three ways VARS are calculated in a resistive circuit?
VARS=ILEL
VARS=EL2/XL
VARS=ILXL
How do you determine the quality of a coil?
The ratio of inductive reactance to resistance in a coil
Inductors with a Q of 10 or greater are considered to be what?
They are said to be pure inductors
What is impedance?
(z) The total opposition to current flow in an AC circuit (The combination of XL and R)
What is a vector?
It is a line that indicates both magnitude and direction
