Question

Find the thevinin resistance of the circuit. I got 118.46 ohms and would like to check my answer. Thanks

R1 R5 M Vout+ 15 100 V1 + R4 R3 470 5 220 R2 Vout- 220

Answer 1

Answer -

   For calculating Thevenin resistance, we have to short circuit the DC voltage source V₁ = 5 V.

After that the total resistance as seen from the output terminal is ,

   $\small R_{th}=\left [ \left [ [R_{1}+R_{2}]\left | \right |R_{3} \right ]+R_{5} \right ]\left | \right |R_{4}$

   $\small R_{th}=\left [ \left [ [15+220]\left | \right |470 \right ]+100 \right ]\left | \right |220$

   $\small R_{th}=\left [ \left [ 235\left | \right |470 \right ]+100 \right ]\left | \right |220$

  
Rth 156.67 + 100) || 220

   $\small R_{th}= 256.67\left | \right |220$

     $\small R_{th}= 118.46$  $\small \Omega$

So, the answer is right.