Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits
Introduction to AC Circuits
Alternating voltage is generated by rotating a coil in a stationary magnetic field. It also be generated by rotating a magnetic field within a stationary coil.
INTRODUCTION
TO AC CIRCUITS
Alternating
voltage is generated by rotating a coil in a stationary magnetic field. It also
be generated by rotating a magnetic field within a stationary coil. Rotating
field method is used for generation of alternating voltage.
Sinusoidal Alternating Quantity
An
alternating quantity which varies according to sine of the angle 9 is known as
sinusoidal alternating quantity
(i)
The sinusoidal voltage and currents produces low iron and copper losses in AC
rotating machines and transformers. It improves the efficiency.
(ii)
Sinusoidal voltage and current will offer less interference to nearby telephone
lines.
(iii)
They produce less disturbance in the electrical circuit.
The
standard form of sinusoidal voltage
e
= Em sin ωt = Em sin Ɵ
The
standard form of sinusoidal current
i
= Im sin ωt=Im sin Ɵ
Sinusoidal
voltage waveform is shown in fig 1.24
Cycle:
It
is a set of positive and negative portions of waveform.
Time
period (T):
The
time required for an alternating quantity to complete one cycle is called
time
period.
Frequency
(f):
The
number of cycles occurring per second is called frequency.
Frequency,
f = 1/T
Unit
of frequency is Hertz (or) Cycles/second
Amplitude
The
maximum value, positive or negative of the alternating quantity is called
amplitude.
Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits : Tag: : - Introduction to AC Circuits
Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits
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