PHYSICS fill in the blanks.

(insulation, source)
In order to distinguish, which wire is live or neutral or of earth, the _______________ is given a specific colour.

(sink, sum)
The earth can be regarded as an electric ________________ .

(fuse, insulation)
Electric _______________ helps in disconnecting a faulty electric circuit and thus, prevents an electric fire.

(sink, sum)
In the series connection of cells, overall emf of the battery is algebraic _______________ of all individual cells connected in series.

(source, sink)
Battery is a small _______________ of electricity.