a.which instrument is shown in the figure?
b.when 100V Ac is applied at A, the current was 2A.calculate the voltage current received at B?
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Answer:
ε is ϕ ahead of i
because i and R is in phase and i.e., −Z and ε are in phase as ε=ε
0
sinwt
from diagram
i=
−Z
ε
0
sin(ωt−ϕ)
where, ϕ=tan
−1
R
X
L
b) i=1.0A (given)
V
R
=160V=iR⇒R=
1
160
=160
V
L
=120V=iX
L
⇒X
L
=
1
120
=120
V
net
=
V
R
2
+V
L
2
=
(160)
2
+(120)
2
=
25600+14400
=200 : effective value of apphed voltage
Z=
R
2
+X
L
2
=
(160)
2
+(120)
2
=200 : Impedence
C) When direct current is passed through the circuit then R will be zero)
at t=ω, inductor will act as plane wire and potential drop will only act occur at R
(i.e.,i=
R
ε
)
For intermediate time
E=iR+
dt
Ldi
where i will vary accordingly
solution
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