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Een accu is een apparaat dat bestaat uit meerdere identieke, on-
derling verbonden galvanische cellen, en dat in staat is chemische
energie op te slaan. Er ontstaat een spanning wanneer twee verschil-
lende metalen zich in een elektrolytoplossing bevinden (galvanische
cel). Deze spanning is afhankelijk van het soort metaal (elektroche-
mische spanningsreeks), de concentratie en de temperatuur van
het elektrolyt. In het geval van lood-zuuraccu's is de positieve plaat
gemaakt van loodoxide en de negatieve plaat van zuiver lood. Ver-
dund zwavelzuur wordt gebruikt als elektrolyt en biedt een nomina-
le spanning van 2 V per cel. Daarom moeten in een accu van 12 V zes
cellen onderling in serie worden verbonden.
Afhankelijk van of accu's al dan niet oplaadbaar zijn, wordt er een on-
derscheid gemaakt tussen primaire elementen, die slechts eenmaal
ontladen kunnen worden, en secundaire elementen, die meerdere
malen opgeladen kunnen worden gedurende hun levensduur.
WAT IS EEN ACCU?
8_TECHNISCHE PRINCIPES
Banner_Technischer_Ratgeber_NL.indd 8 27.07.15 14:04
8


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