The symbol of a _____ consists of parallel lines of different length.

Name the following :

Combination of two or more cells 

Name the following :

In an electric circuit diagram, the term denoted by the arrow marked over the connecting wire symbol. (Choose from: Current/ Potential/ Charge)

Name the following :

A device that glows and produces heat when current flows through it.

Name the following :

A magnet produced by electric current.

Name the following :

A safety device used to prevent excessive current in the circuit.