RESISTANCE AND RESISTIVITY
The resistance of a conductor is the obstruction offered by the conductor to the flow of electric current through it.
Resistance (R) of a conductor is defined as the ratio of the potential difference (V) across the ends of the conductor to the current (I) flowing through it i.e.
The S.I unit of resistance is Ohm. Where 1 Ohm= 1volt/1ampere=1V/1A
Thus 1 ohm is the resistance of a conductor through which a current of 1 ampere flows when a potential difference of 1 volt is applied across the ends of the conductor.
cause of the resistance of a wire: Continue reading “Cause of the resistance in a wire”
You must have knowledge of current. As current is the charge per unit time.
Resistance is the obstruction offered to the flow of current.
Reason: As charge (electrons) flow through the wire (conductor), electrons collide with the walls of the conductor and they also collide with each other. Due to this collision, obstruction occurs and this is called resistance.
Let us understand the concept of resistance with a common daily life experience:
Suppose, you are walking at a place where there is no person, it means you are free to move. Now suppose you are moving at delhi or mumbai railway station, then what will happen? You will face lots of people and you will now face obstruction for your movements. This is basically resistance.