Ko te whakarerekē i te āhua o te pūngao, arā, ka huri mai i tētahi momo ki tētahi. Hei tauira, ko tā te pūrama he huri i te pūngao hiko hei pūngao aho, hei pūngao pōkākā hoki. I roto i te huringa o te pūngao, ka whaihua ētahi o te pūngao, ka moumou ētahi.
Changing energy from one form to another, for example a light bulb transforms electrical energy into light and heat energy. When energy is transformed, some of the energy is used and some is wasted