Electrical Engineering - Transformers - Discussion
Discussion Forum : Transformers - General Questions (Q.No. 9)
9.
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
Discussion:
58 comments Page 1 of 6.
DB Mandal said:
8 years ago
In an ideal transformer vpip = voio means input voltage x input current =output voltage x output current. But if the secondary is shorted the output voltage become zero, however output current is not zero.
Then the formula above fails. exp vp=230V, ip=5A and vo=0v the primary vpip=230 x 5 and secondary voio=0x io=0VA so vpip is not equal to voio. Then the above formula fails, is it not ?
Then the formula above fails. exp vp=230V, ip=5A and vo=0v the primary vpip=230 x 5 and secondary voio=0x io=0VA so vpip is not equal to voio. Then the above formula fails, is it not ?
Srinivas said:
1 decade ago
Basically transformer is a constant flux machine and also constant power machine. that's why when ever we gave to 25w power to its primary. It obviously delivers 25w to load if ideal. If not there is some fractional difference between in input and output. The Efficiency of the transformer is mostly 98%.
Deepak said:
6 years ago
Because we know that
(V2/V1)=(I1/I2) --------------------------> (1)
To solving this (V2*I2)=(V1*I1) -------------------------> (2)
And we know that power=V*I
Then from equation (2) P2=P1.
The power of the primary side will be equal to the power of secondary side.
(V2/V1)=(I1/I2) --------------------------> (1)
To solving this (V2*I2)=(V1*I1) -------------------------> (2)
And we know that power=V*I
Then from equation (2) P2=P1.
The power of the primary side will be equal to the power of secondary side.
(1)
Anshul soni said:
1 decade ago
First of all power factor is not given which is different for input side and output side. So active power can never be equal apparent power can only be equal KVA should be equal on both sides not KW. Whether it is ideal or practical we can't say active power is equal or not.
Kavitagoyal said:
1 decade ago
It is true that transformer is a static device. And it transform voltage from one level to another level, by keeping frequency and power constant. Ideal condition losses are 0 and input power=out power. In practical case losses are consider so answer is 25W.
M MOUNIKA said:
1 decade ago
@Srinivas.
Transformer is a constant flux power and frequency but for practical transformer we have to calculate core losses and copper losses and output = input-total losses from this calculate efficiency = output/input.
Transformer is a constant flux power and frequency but for practical transformer we have to calculate core losses and copper losses and output = input-total losses from this calculate efficiency = output/input.
Ummeaiman aleem said:
7 years ago
Transformer is a device which transform power or energy from one circuit to another circuit.
By increasing or decreasing voltage and current portion ally, so input power and output power remains same, accept some losses.
By increasing or decreasing voltage and current portion ally, so input power and output power remains same, accept some losses.
Manish said:
1 decade ago
Actually in ideal transformer their are no losses. So whatever would be the input that will be output. Practically ideal transformer dosn't exist. That's why when 25w which given to it. It gives same output that is 25w.
Kuldeep said:
1 decade ago
See coments from Gogul on this he has discribed abcd.
Please note power in transformer always costant, only volatage & curent chg wrt turn ratio, multiple of both in primary as well in seconday remains same.
Please note power in transformer always costant, only volatage & curent chg wrt turn ratio, multiple of both in primary as well in seconday remains same.
HAris said:
6 years ago
No, doubt in ideal input=output so the answer is correct = 25W.
But if we calculate it:
E2/E1 = I1/I2 = N2/N1.
THEN,
E2*I2/E1*I1 = N2/N1.
P2/P1 = K
P2 = K*P1
P2 = 10*25 = 250W THEN, THIS WILL BE THE ANSWER.
But if we calculate it:
E2/E1 = I1/I2 = N2/N1.
THEN,
E2*I2/E1*I1 = N2/N1.
P2/P1 = K
P2 = K*P1
P2 = 10*25 = 250W THEN, THIS WILL BE THE ANSWER.
(4)
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