When an electric current flows through a heating element with resistance , the heating power that will be produced can be expressed as . If the required power is W and the resistance of the heating element is Ohm, try to calculate the magnitude of the current that is required without using a calculator.

Wanneer 'n elektriese stroom deur 'n verhittingselement met weerstand vloei, kan die verhittingsdrywing wat geproduseer word uitgedruk word as . As die drywing wat vereis word W is en die weerstand van die verhittingselement Ohm is, probeer om die grootte van die stroom wat nodig is te bereken sonder 'n sakrekenaar.