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Er mwyn i wrthrychau wneud gwaith mae angen egni. Mae 10 math gwahanol, gan gynnwys: cinetig, thermol, potensial disgyrchiant, sain, golau, egni potensial elastig, trydanol, cemegol, niwclear a gwres pelydrol.
Ni all egni gael ei greu na'i ddinistrio, ond gellir ei newid o un ffurf i ffurf arall.
Mae deuddeg gwahanol fath o ffynhonnell egni: Y rhai anadnewyddadwy:
Y rhai adnewyddadwy:
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