transformer used to transfer electrical power from a source of alternating current power to some equipment or device while isolating the powered device from the power source, usually for safety reasons, trafo, mida kasutatakse elektrienergia ülekandmiseks vahelduvvoolu toiteallikast teatud seadmetele või seadmele, isoleerides ohutuse tagamiseks jõuallika toiteallikast, transformer used to transfer electrical power from a source of alternating current power to some equipment or device while isolating the powered device from the power source, usually for safety reasons or to reduce transients and harmonics