Answer / dip

plz suggest

Answer / p.anandsai

 If pressure (Voltage) increases,  current_________. 
if your answer is ” also Increases”.
Then why we say that P = V x I, and V = P/I,
in other words V = 1/I
How can you explain This ?
Actually, according to Ohm,s Law I= V/R, clearly Current is directly proportional to the Voltage, But according to P=VI or I=P/V, it shows that current is inversely proportional to the Voltage.




Now Lets me try to explain this statement. 




It depends on how you increase the voltage if you increase it by keeping the power of the source constant or not,,
if the power of the source is constant then the current would decrease when voltage increasing  ….if you don’t care about the power and just simply replace the battery with a new one’s with higher power rating this can increase the current.




in Transformer, when voltage increases then current decrease because power remains constant…both side power is P=VI




By Ohm’s Law, Current (I) is directly proportional to the Voltage (V) if Resistance (R) and Temperature remain same. 
I = V/R…..or…R=V/I…..or……V=IR.




According to P=VI…or…I=P/V….or …V=P/I,….. It says that Current inversely proportional to the voltage if power remain same.
as we know that in Transformer, If power remain same, and voltage increase, then current decreases in Step Up Transformer. also Voltage decreases when current increases as in Step Down Transformer.




Also on the generation side, same story will be there if power is constant.
but if we improve the power, then current and Voltage both will be increase. 




So Do Not Confuse about this statement.

Answer / k.prakashchandra

Ohms law applies only to ' only resistance ' circuits . The ' No- load current' of a transformer is not equal to Voltage / impedance , but only a fraction

Answer / prti3116

ohms law is applicable only constant temperature operation,but temperature of the transformer should not constant...

Answer / g hanmanth reddy

Transformer works with ac only.Ohms law applicable for DC only.so understand the ans

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