Electrical Engineering - Transformers - Discussion

Discussion :: Transformers - True or False (Q.No.1)

1. 

If the voltage is stepped up, the current is stepped down, and vice versa.

[A]. True
[B]. False

Answer: Option A

Explanation:

No answer description available for this question.

Calphonse said: (Jan 11, 2011)  
In transformer the power and frequency always remains the same hence when the voltage is stepped up then the current will be stepped down.

R.Ashok said: (Jan 22, 2011)  
@Calphonse

Please tell me how it is by using voltage principle.

Zia Ahmed said: (Feb 20, 2011)  
For transformer voltage and current are inversely propotional.

Kartheek said: (Feb 20, 2011)  
V1/V2 = I2/I1

Saumitra said: (Feb 26, 2011)  
As in case of ideal transformer the demagnetising ampere turns should be equal and opposite to magnetising ampere turns therefore
I1*T1=I2*T2

means to say that current in each winding is inversly proportional to no of turns(no of turns is directly proportional to voltage)

therefore when the voltage is stepped up, means that that winding has more no of turns than the other one, therefore there will be low current in comparision to other winding.

Azagu said: (Aug 7, 2011)  
In tranformer power & freq are transmitted.

These factors not be changing, in case the given transformer is step up (or)step down is not the thing.

Input power = Output power.

Rahul Sharma said: (Nov 11, 2011)  
For the power to be of same magnitude at secondary side of transformer if voltage is stepped up proportionally current has to be reduced.

N.Sunil Kumar said: (Jan 26, 2012)  
For a transformer output power is constant so, if voltage increases automatically current will dicreses why because we know that

Power P= V*I

Sms said: (Aug 22, 2012)  
If transformer voltage is inversly proportional to current. so current step down.

P=V*I : V=P/I

P.Gopalreddy said: (Mar 20, 2014)  
We know that according to ohm' law rho is directly proportional to current and inversely proportional to I. Hence I and V are inversely proportional to each other.

Ganeshramalakshmi said: (Sep 17, 2018)  
Input power is equal to output power because of transformer principle without a change in power. So voltage down means current increase.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.