1. The problem statement, all variables and given/known data The circuit looks like this: http://i.imgur.com/QtgiCdR.png R1= 10 Ω R2= 8 Ω R3= 3 Ω R4= 5 Ω R5= 2 Ω V= 15 V I'm trying the find the current in R1 by using Thevenin's Theorem. 2. Relevant equations Basic Circuit Analysis Formulas 3. The attempt at a solution So I calculated the voltages at the points where R1 is removed. 15V on the left side and 90/101V on the right side (confirmed by LTspice). Then I tried to calculate the Thevenin resistance which (once the voltage source is shorted) is the R2 || R3 || (R4 + R5) which turns out to be 168/101Ω. So putting everything together now, Vth = 15 - 90/101 and Rth = 168/101 and Rl = 10, I get that the current in R1 is 1.2096A but according to LTspice, it should be 1.22003A. What am I doing wrong?