I quickly became engrossed with independent research on electricity.
After this, write a paragraph about what you have discovered in your research. Just add a few sentences before, "Recently, I became immersed in the development of sensors for detecting power cable deterioration. Although..." Keep this, but add some sentences before it. Add sentences about articles you have read. Also, if you have not read The Body Electric by Becker, I recommend it!
Oh, I know what to do! Add another sentence to the end of the first paragraph. It is a weak thesis to say, "I became engrossed in the study." It is better to give a sentence that tries to capture the meaningful lesson that is represented by your study. What did it amount to?
Whatever that is, you have to capture it in a thesis statement.
Then, write your topic sentences so that they express the truth of the thesis:
The thesis might be, "I discovered that the way energy changes forms but can never be created or destroyed has symbolic meaning that can make it like a lesson about the nature of human life."
If that was your thesis, you would write topic sentences based on it:
One of the challenges involved While modeling the electrical properties of the sensors, I gained the insight that these sensors and the human nervous system share a common underlying principle.
As of now, your thesis is simple. It is okay, but if you are trying to crank up the intensity go to your central message and make it something fascinating.
If your central message is, "I became enthralled with the study of electricity," that is not fascinating. Write a sentence about what you discovered!