Every thing is just a convention. We can’t say that for instance take transformer, if we theoretically prove that transformer(here) has 250ohm that doesn’t means that that this transformer has 250 ohm only.When we use that transformer we get more or less than that of predicted ohmic resistance. It’s just a prediction. Every things are concepts.. got it? In real world nothing is perfect.
Every thing is just a convention. We can’t say that for instance take transformer, if we theoretically prove that transformer(here) has 250ohm that doesn’t means that that this transformer has 250 ohm only.When we use that transformer we get more or less than that of predicted ohmic resistance. It’s just a prediction. Every things are concepts.. got it? In real world nothing is perfect.