dikca -dic- gismu

x1 is electricity [electric charge or current] in/on x2 of polarity/quantity x3 (def. negative).

(x3, a quantifier, can be expressed as a simple polarity using the numerals for positive and negative ma'u and ni'u); (explicitly) negative (= dutydikca), positive (= mardikca); current (= (sel)muvdikca; again default negative/electron current), charge (= klodikca, stadikca). See also lindi, xampo, flecu, maksi, tcana.

In notes:

flecu
x1 is a current/flow/river of/in x2 flowing in direction to/towards x3 from direction/source x4.
lindi
x1 is lightning/electrical arc/thunderbolt striking at/extending to x2 from x3.
maksi
x1 is magnetic [adjective] producing magnetic field x2.
tcana
x1 is a station/node of/in/on transport/communication/distribution system/network x2.
xampo
x1 is x2 ampere(s) [metric unit] in current (default is 1) by standard x3.
dictergu'i
g3=d2 is an electric lamp illuminating g2 with light g1.
mardikca
d1 is positive electric charge in d2.