The title of the question is "Find the Thevenin's Voltage," and the first line is "Please solve this." In its current form, it is a straightforward homework question.
If there is a deeper, on-topic question contained inside, then the question should be edited to contain only that question.
I agree with you: while most questions about engineering are off-topic for us, we make an exception for engineering-like questions about experimental apparatus. I've retagged and reopened the question.