Ọ dabara adaba maka ịrụ nha nke nguzogide mkpuchi (IR), absorption ratio (DAR), polarization index (PI), leakage current (Ix) na ike absorption (Cx) nke ụdị ngwa voltaji dị elu, gụnyere switchgear, transformers, reactors, capacitors, moto, generators na cables, wdg.