What might cause a transformer to malfunction in a circuit?

A transformer is designed to operate within specific load parameters. When the load demand exceeds the transformer’s capacity, it can lead to overheating, excessive vibrations, and eventual failure. This increased load may cause the transformer to exceed its thermal limits, leading to insulation breakdown and short circuits.

In contrast, proper insulation of the wiring ensures that electrical leakage and short circuits are minimized, while standard operating conditions signify that the transformer is functioning within its designated parameters. Regular maintenance checks help identify issues before they lead to malfunctions, ensuring the transformer operates reliably. Therefore, option B, which addresses the possibility of increased load demand, accurately identifies a primary cause of transformer malfunctions in a circuit.