Understand the distinction
Electricity is a way energy can be delivered, while the sources used to generate it can differ. Thinking about source, conversion and use as separate stages makes a household diagram clearer. It also avoids assuming that a wall socket identifies one particular generation source.
Put it in your home notes
Draw three boxes: source, delivery and end use. Add only information you actually know about your home, leaving unknowns visible. Use a dated supplier or official record when describing a specific supply mix rather than assigning the general illustration to every household.