According to Ohm's law for a portion of the circuit we have:
U=RI=>I=U/R=24/3=8 A
The correct answer is B
It is an imaginary transformer which has no core loss, no ohmic resistance and no leakage flux. The ideal transformer has the following important characteristic. The resistance of their primary and secondary winding becomes zero. The core of the ideal transformer has infinite permeability.
Answer:
plz write your questions in English
Answer:
![R=803k\Omega](https://tex.z-dn.net/?f=R%3D803k%5COmega)
Explanation:
We have the following information,
![V_0 = 12V\\V=10V\\c= 1.25*10^{-6}F\\t=1.8s](https://tex.z-dn.net/?f=V_0%20%3D%2012V%5C%5CV%3D10V%5C%5Cc%3D%201.25%2A10%5E%7B-6%7DF%5C%5Ct%3D1.8s)
We apply the equation for capacitor charging the voltage across it,
![V=V_0 (1-e^{-t/x})\\e^{-t/x}=1-(\frac{V}{V_0})\\-\frac{t}{Rc}=ln(\frac{V}{V_0})\\R=-\frac{t}{ln(\frac{V}{V_0})*c}](https://tex.z-dn.net/?f=V%3DV_0%20%281-e%5E%7B-t%2Fx%7D%29%5C%5Ce%5E%7B-t%2Fx%7D%3D1-%28%5Cfrac%7BV%7D%7BV_0%7D%29%5C%5C-%5Cfrac%7Bt%7D%7BRc%7D%3Dln%28%5Cfrac%7BV%7D%7BV_0%7D%29%5C%5CR%3D-%5Cfrac%7Bt%7D%7Bln%28%5Cfrac%7BV%7D%7BV_0%7D%29%2Ac%7D)
Replacing values,
![R=-\frac{1.8}{ln(10/12)*1.25*10^{-6}}](https://tex.z-dn.net/?f=R%3D-%5Cfrac%7B1.8%7D%7Bln%2810%2F12%29%2A1.25%2A10%5E%7B-6%7D%7D)
![R=803k\Omega](https://tex.z-dn.net/?f=R%3D803k%5COmega)