why doesnt voltage buffer works in this circuit?

[Nygen Patricia]

Hi all


We encountered a problem today: when the nonideal voltage source is connect to our circuit, we found out that the two terminals of this voltage source is 7V as oppose to 10V when nothing is connected. We suspect that our circuit was loading the source, and decided to add a buffer. However, that buffer doesn't work. We decided to simulate using multisim, and even in multisim, it still doesn't work. can you guys please refer to the picture?

 

[Audioguru]

You didn't read the datasheet for the LM358 dual opamp:
1) It is low power so it is weak.
2) Its maximum allowed supply is 32V but you have 80V.
3) Its minimum output current in your circuit is is 20mA but the light bulb is shown in your second schematic to draw 1000mA.