The children put signs on different devices such as whiteboards with symbols on such as vampires to indicate possible vampire devices that use energy even when they aren't being used.
Disgrifiad o'r gweithgaredd
Bydd disgyblion yn nodi’r holl offer TG, teclynnau a goleuadau drwy’r ysgol ac yn nodi pa rai y gellir eu diffodd gan ddefnyddio system codio goleuadau traffig.
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