An alloy is combination of a metal and a non metal. So it has partial characteristics of metal and non metal. Being analloy the ions it it are randomly arranged. It does not have a specific arrangement of ions. Hence the flow of electrons in this is more. The This feature of alloy leads to increase in resistivity due to free crystal lattice. We know that metals have high melting point but an alloy has low melting point beacause the presence of a non metal in it behaves as an impurity and restricts in raising to high melting point. Due to high melting point the it takes a lot of current to melt and leads in slow movement of electrons which makes the device less efficient. Therefore electronic device requires the metal of low melting point. An alloy plays the best role in the elctronic device like electric iron and heater.