Single phase ac systems and basic terminology

Question 1

phase of an AC and phase angle formula and meaning

Answer 1

fraction of time period that elapsed from the last reference chosen

PHASE angle
it is the corresponding electrical angle which has elasped after the quantity has passed through the given/ chosen reference

theta = 2pif*t = wt

Question 1

RMS

Answer 1

That steady current which, when flows through a resistor of known resistance for a given period of
time than as a result the same quantity of heat is produced by the alternating current when flows
through the same resistor for the same period of time is called R.M.S or effective value of the
alternating current.

Question 2

voltage and current full formula in single phase systems

Answer 2

√Vr^2+VL^2+2VrVLcos(θ)
√Ir^2+IL^2+2IrILcos(θ)
V = vr+vcoil

Question 3

Power factor improvement

Answer 3

Reducing phase difference btw volatage and current

Inductive loads used need reactive power
Capacitor installed parallel to reacirve power
Capacitor power shouldnt be installed in series as impedance will increase

Advantage
I squared R is reduced
Reactive power will he reduuced
A hivher power factor will help in utilizing the load
Improves performance of motor