Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 4)
4.
If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 
?
?250
25
6,250
62,500
Discussion:
46 comments Page 2 of 5.
Sunil gorga said:
1 decade ago
v1i1=v2i2
v1*v1/r1=v2*v2/r2
(v1/v2)^2=r1/r2
we know n1/n2=v1/v2
so (50/10)^2=r1/250
r1=250*5=6250
v1*v1/r1=v2*v2/r2
(v1/v2)^2=r1/r2
we know n1/n2=v1/v2
so (50/10)^2=r1/250
r1=250*5=6250
Anil said:
1 decade ago
Resistance matching R1=(n1/n2)^2*rL
hence, r1=(50/10)^2*250
= 25*250
=6250 ohm
hence, r1=(50/10)^2*250
= 25*250
=6250 ohm
Mahendra chauhan said:
1 decade ago
# given data primary coil turns=50,secondary coil turns=10 & secondary load 250 ohm.
#equation N=secondary coil turns/primary coil turns
(Rpri=reflected in to primary)
Rpri=(1/n)^2*RL
so N =10/50
=0.2
Rpri =(1/0.2)^2*250
=(5)^2*250
=25*250
=6250.
#equation N=secondary coil turns/primary coil turns
(Rpri=reflected in to primary)
Rpri=(1/n)^2*RL
so N =10/50
=0.2
Rpri =(1/0.2)^2*250
=(5)^2*250
=25*250
=6250.
Mahendra dhakchavle said:
1 decade ago
R2=250
k=n1/n2=50/10
R1=R2*k^2
=250*(2500/100)
R1=6250ohm
k=n1/n2=50/10
R1=R2*k^2
=250*(2500/100)
R1=6250ohm
Kalyan said:
1 decade ago
Rs=250
I1^2Rs=I2^2Rf
(I1/I2)^2*Rs=Rf
From Transformation ratio N2/N1=I1/I2=K
(50/10)^2*250=Rf
25*250=Rf
Rf=6250ohm
I1^2Rs=I2^2Rf
(I1/I2)^2*Rs=Rf
From Transformation ratio N2/N1=I1/I2=K
(50/10)^2*250=Rf
25*250=Rf
Rf=6250ohm
Sunil keshari said:
1 decade ago
N1=50
N2=10
R2=250 ohm
K=(N2/N1)
(R2/R1)=K^2
(250/R1)=(10/50)^2
R1=(2500*250)/100
R1=6250 ohm
N2=10
R2=250 ohm
K=(N2/N1)
(R2/R1)=K^2
(250/R1)=(10/50)^2
R1=(2500*250)/100
R1=6250 ohm
Nidhi M J said:
1 decade ago
Copper losses produced by r2 in primary side must be same as that in secondary side.
I1^2*r2'=I2^2*r2
R2'= (I2/I1) ^2*r2
Where I2/I1=N1/N2.
I1^2*r2'=I2^2*r2
R2'= (I2/I1) ^2*r2
Where I2/I1=N1/N2.
Virendra ranpise said:
1 decade ago
Resistance ratio=R2/R1
Xmer ratio(K)=N2/N1
Where,
R1=Primary winding resistance
R2=secondary winding resistance
N1=Primari winding turns
N2=secondary winding turns
FORMULA FOR CALCULATING R1
R2/R1 = K square
i.e. R2/R1 = (N2/N1)square
250/R1 = (10/50) square
So
R1 = (250) / ((10/50) square)
R2=6250 ohm
Xmer ratio(K)=N2/N1
Where,
R1=Primary winding resistance
R2=secondary winding resistance
N1=Primari winding turns
N2=secondary winding turns
FORMULA FOR CALCULATING R1
R2/R1 = K square
i.e. R2/R1 = (N2/N1)square
250/R1 = (10/50) square
So
R1 = (250) / ((10/50) square)
R2=6250 ohm
Akshat gupta said:
1 decade ago
Where
n1=50
n2=10
r2=250ohm
so
resistance matching r1= (n1/n2)^*rl
hence,
r1=(50/10)^2*250
=25*250
=6250 ohm
n1=50
n2=10
r2=250ohm
so
resistance matching r1= (n1/n2)^*rl
hence,
r1=(50/10)^2*250
=25*250
=6250 ohm
S.ANJINEYULU NAIK said:
1 decade ago
Turn ratio, k=N2/N1.
=10/50.
=1/5=0.2.
Actual resistance in secondary circuit is R2=250 ohm's.
Reflective resistance means, the secondary resistance referred to primary winding is,
R2'=R2/k^2.
=250/ (0.2) ^2.
=250/0.04.
=6250 ohm's.
=10/50.
=1/5=0.2.
Actual resistance in secondary circuit is R2=250 ohm's.
Reflective resistance means, the secondary resistance referred to primary winding is,
R2'=R2/k^2.
=250/ (0.2) ^2.
=250/0.04.
=6250 ohm's.
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