What belongs in your text
Explain the new work you want to take on and the skills you already have. For electrical technician, this matters when you inspect systems and install wiring. Write what you did, where it happened and why the work was useful.
A good example is a short account of how you record readings and report faults. It shows real work rather than an empty claim. If you have not done that task, choose a different example from your own work.