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| Math | maint corfforol, material property, maint dwys, meintiau sgalar  |
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| Y gwrthwyneb | dargludedd trydanol |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
Mae Gwrthedd yn fesur o gryfder defnydd i wrthwynebu cerrynt trydanol. Mae defnydd gwrthedd isel yn gallu cludo cerrynt heb gymaint o wrthiant â defnydd sydd a mwy o wrthedd. Ohm Medr (Ω m) ydy'r uned SI.
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