NEET Physics Alternating Current Revision Notes

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Revision Notes for Full Course Alternating Current Alternating Current

Full Course Alternating Current students should refer to the following concepts and notes for Alternating Current in Full Course. These exam notes for Full Course Alternating Current will be very useful for upcoming class tests and examinations and help you to score good marks

Alternating Current Notes Full Course Alternating Current

 

Alternating Current:
 
An alternating current (a.c.) is a current which continuously, changes in magnitude and periodically reverse in direction’.
i = I0 sin ωt = I0 sin (2π/T) t
Here I0 is the peak value of a.c.
(a) Current, I =I0 sin ωt
(b) Angular frequency, ω= 2πn (n is the frequency of a.c.)
(c) I =I0 sin 2πnt

 

NEET Physics Alternating Current Revision Notes

 

• Mean value of A.C or D.C. value of A.C.:-
 
Mean value of a.c. is that value of steady current which sends the same amount of charge, through a circuit, in same time as is done by a.c. in one half-cycle.
 
NEET Physics Alternating Current Revision Notes-1
 
(Iav)half cycle = (2/π)I0
Thus, mean value of alternating current is 2/π times (0.637 times) its peak value.
(Vav)half cycle = (2/π) V0
 
• Average value of A.C. over a complete cycle:-
Iav = 0
The average value of a.c. taken over the complete cycle of a.c.is zero.
 
• Root mean square value of a.c. or virtual value of a.c.:-
 
Root mean square value of alternating current is defined as that value of steady current which produces same heating effect, in a resistance, in a certain time as is produced by the alternating current in same resistance in same time. The r.m.s value of a.c.is also called its virtual value.

Irms = I0/√2

Root mean square value of alternating current is I/√2 times (or 0.707 times) the peak value of current.
 
Similarly, Vrms= V0/√2
Here V0 is the peak value of e.m.f.
 
• Form Factor:-
Form Factor = rms value/average value = (V0/√2)/ (2 V0/π) = π/2√2
 
• Current elements:-
(a) Inductive reactance:- XL = ωL
Here, ω = 2πn, n being frequency of a.c.
L is the coefficient of self-inductance of coil.
 
(b) Capacitative reactance:- Xc = 1/ωC
Here C is the capacity of the condenser
 
• Capacitor in AC circuit:-
q = CV0sinωt
I = I0 sin(ωt +π/2)
V0 = I0/ωC
Xc = 1/ωC
NEET-Physics-Alternating-Current-Revision-Notes 1
 
• Inductor in AC circuit:-
VL = L(dI/dt) = LI0ω cosωt
I = (V0/ ωL) sinωt
Here, I0 = V0/ ωL
XL = ωL
And the maximum current, I0 = V0/XL
NEET-Physics-Alternating-Current-Revision-Notes 2
 
• R-L circuit:-
?I = ε/R [1-e-Rt/L]
V = ε e-Rt/L

NEET-Physics-Alternating-Current-Revision-Notes 3

 Graph between I (amp) and t (sec):-
NEET-Physics-Alternating-Current-Revision-Notes 4
?
 
 Graph between potential difference across inductor and time:-
NEET-Physics-Alternating-Current-Revision-Notes 5
 
?
 
 L-C Circuit:-
 
?
f = 1/2π√LC
q = q0 sin (ωt+?)
I = q0ωsin (ωt+?)
ω = 1/√LC

NEET-Physics-Alternating-Current-Revision-Notes 6

 

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NEET Full Course Alternating Current Alternating Current Notes

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Notes for Alternating Current NEET Full Course Alternating Current

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Alternating Current Notes for Alternating Current NEET Full Course

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Alternating Current NEET Full Course Alternating Current Notes

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Notes for NEET Alternating Current Full Course Alternating Current

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