Stabilizer listrik, travo, transformator, batu bateral, accu, pesawat telepon, trafo, ikat pinggang keamanan, mesin faksimili, optik, kaca mata, lensa-lensa, mikroskop, teropong, teleskop, pesawat komunikasi, telephone, walky talky, handy talky, pesawat telex, laser disk, antena, booster, radar, parabola, kotak accu, baterai, pengisi bateral, bel listrik, ballast, step up, step down, mesin faksimile, mesin teleks, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, stop kontak, sakelar, switch-switch, fiting-fiting, stecker, sonar, seterika listrik, mesin fotocopy, pesawat-pesawat pemadam api, alat solder listrik, stabilizer motor (stavol), UPS (Uninteruptible Power Supply), adaptor