Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 16)
16.
A certain amplifier has 600 
internal resistance looking from its output. In order to provide maximum power to a 4 speaker, what turns ratio must be used in the coupling transformer?
internal resistance looking from its output. In order to provide maximum power to a 4 speaker, what turns ratio must be used in the coupling transformer?Discussion:
19 comments Page 1 of 2.
ShaijuTS said:
1 decade ago
Pow((Ns/Np),2) = Zs/Zp
ie. pow(k,2) = 4/600
k=sqrt(4/600)
k=0.08
ie. pow(k,2) = 4/600
k=sqrt(4/600)
k=0.08
Saritha said:
1 decade ago
Here,
Load resistance(destination)=4 ohms
Source resistance=600 ohms
k=(r2/r1)^0.5
=(4/600)^0.5
=0.0816
k=0.0816 ohms
Load resistance(destination)=4 ohms
Source resistance=600 ohms
k=(r2/r1)^0.5
=(4/600)^0.5
=0.0816
k=0.0816 ohms
Siri said:
1 decade ago
@Saritha.
Transformation ratio is unit less quantity.
Not measured in ohms.
Transformation ratio is unit less quantity.
Not measured in ohms.
Manish said:
1 decade ago
V2/I2 = 4.
V1/I1 = 600.
V2xI1/V1xI2 = 4/600.
N2 = 4/600N1 = 0.08.
V1/I1 = 600.
V2xI1/V1xI2 = 4/600.
N2 = 4/600N1 = 0.08.
Akash.bhure said:
1 decade ago
Internal resistance(R1)=600 ohms.
Output speaker(R2)=4 ohms.
R1 = R2/K^2.
600 = 4/K^2.
K^2 = 4/600 = 0.0066.
K = sqrt(0.0066) = 0.081.
Output speaker(R2)=4 ohms.
R1 = R2/K^2.
600 = 4/K^2.
K^2 = 4/600 = 0.0066.
K = sqrt(0.0066) = 0.081.
Love said:
1 decade ago
But it is asked to determine turn ratio = 1/K.
Ashim said:
1 decade ago
Turns ratio K = N2/N1= sqrt (R2/R1) = sqrt (4/600) = 0.08.
E.sravani said:
1 decade ago
Power = i^2r.
Input power = i1^2r1 = i1^2(600).
Output power = i2^2r2 = i2^2(4).
P(in) = P(out).
i1^2(600) = i2^2(4).
K^2 = (4/600) {(i1/i2)^2 = k^2}.
K = 0.08.
Input power = i1^2r1 = i1^2(600).
Output power = i2^2r2 = i2^2(4).
P(in) = P(out).
i1^2(600) = i2^2(4).
K^2 = (4/600) {(i1/i2)^2 = k^2}.
K = 0.08.
Rakesh alliwar said:
9 years ago
Yes, 0.08 is the correct answer.
Rajesh said:
9 years ago
Transformer transfer constant power.
V1 * I1 = V2 * I2.
V1 * V1/r1 = V2 * V2/ r2.
V1 ^2 / r1 = V2 ^2 / r2.
Sq of (V2/V1) = r2 / r1.
(V2 / V1) = sq rt of (r2 / r1).
k = sq rt of (4 / 600).
k = 0.081.
V1 * I1 = V2 * I2.
V1 * V1/r1 = V2 * V2/ r2.
V1 ^2 / r1 = V2 ^2 / r2.
Sq of (V2/V1) = r2 / r1.
(V2 / V1) = sq rt of (r2 / r1).
k = sq rt of (4 / 600).
k = 0.081.
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