0
\$\begingroup\$

enter image description here

I just started network theory and stuck to this problem, in book it is written that an ideal transformer supplies constant power, so I randomly assume a question as shown in figure and try to find current in secondary side but I got two different answers for same current calculation, so where I'm going wrong and how to calculate current in this case correctly?

\$\endgroup\$

1 Answer 1

1
\$\begingroup\$

The mistake you made was in pre-defining the primary current as 2 amps. You broke ohms law at this point (retrospectively).

If there is 6 amps flowing in the secondary due it producing 30 volts across a 5 ohm load then clearly, there is more current in the primary than what flows in the secondary hence, your figure of 2 amps is wrong.

$$I_1 = \dfrac{V_2\times I_2}{V_1} = \dfrac{30\times 6}{10} = 18$$

Primary current has to be 18 amps.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.