Do transformers obey ohms law..

[ali ghafoor]

we've used transformer as a VOLTAGE AMPLIFIER to get more power output......if it were not used the power output is very less only 0.001 watts which is probably insufficient to drive our circuit!!!!! so,we amplify voltage as....POWER=V2/R......so transformer is used to get sufficient power at the load to drive our load...

 

[keith1200rs]

If you use a transformer to increase the voltage you will DECREASE the current. You CANNOT get more power out than you put in!

Keith

 

[ali ghafoor]

i have explained earlier......i want more power at output ....by increasing voltage...IS also increases....so power is increased....and input power will also be increased because IP will increase..........so you are correct.we can't get more power output than we put in...actually...we are drawing more current from our generator to get more power output...(input power is also increasing)..so our generator must be able to fulfill our required Ip...generators have current rating on them.so we should choose according to our particular application..........
are you satisfied now???

 

[keith1200rs]

are you satisfied now???

I don't need to be "satisfied". I am merely pointing out incorrect or ambiguous statements. Your statements don't seem to relate to the original question anyway.

Keith.

 

[Kral]

SanjKrish,
Think of the secondary load as being reflected to the primary by a factor equal to the square of the turns ratio. For a 10:1 turns ratio, a 1 Ohm resistor load on the secondary appears as a 100 Ohm resistor on the primary.
Regards,
Kral

 

[BlueRaja]

I've written a blog-post on the subject here, which should hopefully clear up some of the confusion.

 

[electrikbill]

This is getting more complicated than it needs to, basically, when using a higher voltage, it takes less current to produce the same amount of power (watts) than when using a lower voltage. Higher voltages are used on transmission lines to reduce the voltage drop on the line, caused by the resistance and power loss of the line. This allows us to use smaller conductors on power lines. If the voltages were lower, we would need to use larger conductors (less resistance) to have the same voltage (or slightly lower) available on the other end.