Electricity

An electric fuse melts because of the heating effect of electric current. Excessive current generates heat that melts the fuse wire, breaking the circuit and preventing damage to appliances.

Electric power is the rate at which electrical energy is consumed or converted into other forms of energy. It is measured in watts (W).

In a series circuit, the components are connected end-to-end, and the current is the same through each component. In a parallel circuit, the components are connected across the same two points, and the voltage across each component is the same, but the current divides among the branches.

The SI unit of electric current is the ampere (A).