i dont understand the consept of Resistance :(

Question

anonymous · Answer

resistance is obstruction to flow of current in a conductor

theeric · Answer

Yep.

Resistance is when a material make it hard for there to be a movement of charge. Electrons have a negative charge. You can give them a voltage, which is a force on them. And so the electrons will then move. But some materials  make it hard for the electron to continue. The electron will continue, because it has that voltage, but it will be resisted.

The resistance could be caused by many interactions within the material.

anonymous · Answer

Resistance is a measure of how well a material conducts an electric charge and is measured in ohms. Resistance decreases the amount of current in a circuit, because it opposes current.

unklerhaukus · Answer

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anonymous · Answer

Maybe you don't understand why resistance is there in the first place? 
to understand that you need to go a lil deep into the atomic structure.. but its not that hard to understand.. you see.. when you learn about currrents in high school you tend to think the electrons flow nicely in a straight line in an ordered fashion.. but that is not true.. the electrons keep vibrating like crazy.. and keep bumping into the crystal lattice.. and give up their energy.. so you see this is the origin of resistance.. there is no PHYSICAL OBSTRUCTION so to speak.. 

If you know your concepts of heat and temperature, you may knwo that these violent vibrations of electrons depend on temperature.. and thus the resistance also depends on temperature.. if you increase temperature, then these electrons vibrate more and thus bump more and hence resistance increases.. 

if you keep cooling then resistances because electrons gain more ORDER (loosely speaking) and so for certain metals there comes a temperature where electrons lose almost all their vibrations and become a super conductor.. 

anwyays hope you get the point :P.. ask if you are interested more!