Kaheklemmiseade on seadmetüüp, mis koosneb kahest klemmist, mille vahel voolab vool ja pinge, ning neid kasutatakse paljudes igapäevastes rakendustes, alates tarbeelektroonikast, mõõtevahenditest kuni tööstuslike tootmissüsteemideni, nagu nt kaheklemmitakisti, kus iga klemmi saab kasutada nii voolu kui ka pinge jaoks.
Two-terminal devices are a type of device that is comprised of two terminals with current and voltage flowing between them, and are used in many everyday applications, from consumer electronics, measurement instruments to industrial production systems. For example two-terminal resistor, each terminal being able to be used both for current or potential.