I need help deciphering this circuit

MrChips

Joined Oct 2, 2009
30,988
Let's go back and do it step by step.

Step 1
R6 = R4 + R5 = 10 + 10 = 20

Step 2
R7 = R3//R6

1/R7 = 1/R3 + 1/R6 = 1/10 + 1/20 = (20 +10)/(10*20) = 30/200 = 3/20
R7 = 20/3

Step 3
R8 = R2 + R7 = 10 + 20/3 = (30 + 20)/3 = 50/3

Step 4
RT = R1//R8

1/RT = 1/R1 + 1/R8

I will leave it to you to calculate RT.
 
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