Rezistoarele de volum sînt realizate dintr-un amestec de material conductor (grafit, negru de fum) şi un material izolant de umplutură (talc, bioxid de titan, caolin ele.). Structura internă a unui astfel de rezistor este ilustrată în fig. 1.19 a, iar schemaelectrică echivalentă între trei granule de material conductor cuprinde: Rg — rezistenta granulei, R — rezistenta dintre granule, iar Cg — capacitatea parazită, fig. 1.19 b.
Fig. 1.19. Rezistor de volum: a) Structura internă: 1 — granulă de material conductor, 2 — material izolant; b) schema electrică echivalentă.
Acest tip de componente are o tehnologie simplă şi prezintă robusteţe electrică şi mecanică bună, dar majoritatea proprietăţilor electrice sînt inferioare altor tipuri. Nu sini rezistoare de precizie şi nu se fabrică în ţara noastră.
În tabelul care urmează sînt cuprinşi parametrii electrici esenţiali ai rezistoarelor fabricate în ţară, la I.P.E.E. — Curtea de Argeş.
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