question about the difference between components..

i got here these two components

ImageShack - Hosting :: 64333414ko8.jpg

i assume that this twisted square is some sort of battery
but unlike normal battery
when i looked at the solutions of questions regarding its KVL equations
i got that unlike the normal battery when we go from + to - (inside threw the component )we get +V in the KVL equation

unlike a normal battery
when we go from + to - (inside threw the component )we get -V in the KVL equation
????

It is a Dependent source, which means its value depends on some other characteristic of the circuit. It might have a relation to the current or voltage at another component. See other thread about the KVL equations.