From Wikipedia, the free encyclopedia
Mae coulomb (symbol: C) yn uned SI rhyngwladol sy'n hafal i un uned o wefr trydanol, sef oddeutu 6.24151 × 1018 proton neu −6.24151 × 1018 electron.[1] Cafodd yr uned hon ei henwi ar ôl Charles-Augustin de Coulomb.
Un coulomb, felly, ydy'r maint o wefr trydanol sy'n cael ei symud mewn un eiliad gan gerrynt cyson o un amper.[2][3][4]
a hefyd:
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