1. Charge Carriers:
Materials that allow the flow of electric current are known as conductors. Conductors contain an abundance of free charge carriers. In metals, the primary charge carriers are free electrons, which are not bound to any specific atom. These free electrons can move freely throughout the metal.
2. Electric Field:
When a potential difference (voltage) is applied across a conductor, it creates an electric field. This electric field exerts a force on the free charge carriers, causing them to accelerate and move in a specific direction.
3. Drift Velocity:
Under the influence of the electric field, the free charge carriers move with a certain average velocity known as drift velocity. Drift velocity is the net velocity attained by the charge carriers due to the applied electric field.
4. Collisions:
As the charge carriers move within the conductor, they collide with atoms, ions, impurities, and other lattice defects. These collisions cause the charge carriers to experience resistance to their motion and lose some of their kinetic energy. The energy lost through collisions is released as heat or light.
5. Ohm's Law:
The relationship between the voltage applied across a conductor and the resulting current is described by Ohm's law. Ohm's law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) applied across it, provided the temperature and other physical parameters remain constant. Mathematically, this relationship is expressed as:
I = V / R
Where:
- I: Current in amperes (A)
- V: Voltage in volts (V)
- R: Resistance of the conductor in ohms (Ω)
In summary, electrical conduction involves the movement of free charge carriers within a conductor, driven by an applied electric field. As the charge carriers move, they encounter resistance from collisions, leading to the production of heat or light due to energy loss. The relationship between voltage, current, and resistance in a conductor is governed by Ohm's law.
