This is the question from my homework:

*In the bridge circuit of Figure 7, obtain expressions for the Thévenin equivalent voltage source and resistance of the part of the network connected to the load resistor RL. If the bridge resistors R1, R*2,

*R*3 and

*R*4 have resistances of 1k-ohm, 2k-ohm, 4k-ohm, and 6k-ohm respectively. Calculate the current through the load resistor when

*RL*= 500 . [

*Answer: 0.188 mA*]

I'm not totally confident with Thevenin's Theorem yet so maybe I'm doing something wrong but this is as far as I got: