Electrical Resistance

It simply defines as the opposition to the current flow in an electric circuit .There are five factors that affect conductor resistance; "conductor length, conductor diameter, temperature, physical condition and conductor material type" let us know about each factor:
Conductor length:
When we apply a voltage on a conductor connected to a load, electrons will be pushed in the conductor to operate the load and the longer the conductor the more resistance of it and the more voltage drop on it. Conductors manufacturers commonly provide the buyer with ohms per km to realize the overall conductor resistance so if you need to replace a conductor, you should take in account the conductor length.
Conductor Diameter:
The more the conductor diameter, the less the conductor resistance and the more the current flow in the conductor. So if you need to install a conductor in an electrical circuit you must choose the proper size that fits circuit current flow.
Conductor Material Type:
The more free electrons in the conductor material, the less the conductor resistance and the more current carrying capability of the conductor like "copper, gold, silver and aluminum" materials which consider as less resistance materials and in the other hand, materials like rubber, glass, ceramic and plastics consider as a high resistance material due to the no presence of free electrons.
In the conductors when the wire temperature increase the electrons move faster but not in the correct direction and hence the resistance increase. But in insulators when the temperature increase the resistance decrease and in semiconductor devices when the temperature increase, the resistance decrease.
Physical Conditions:
This conditions are like, when we have partially cut on the conductor or when we have bad connection between conductors ….etc. All of this increases the resistance so you should take care of conditions like this. 

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