Physics – 4.2.2 Electric current | e-Consult

Electric current is defined as the rate of flow of electric charge. It represents the movement of charged particles, typically electrons, through a conductor. The flow of charge can be visualized as a stream of particles moving in a particular direction.

The number of charge carriers in a material directly affects the magnitude of the electric current. Current (I) is directly proportional to the number of charge carriers (n). For a given voltage (V) and resistance (R), a material with more charge carriers will allow a larger current to flow. This is because more particles are available to carry the charge, leading to a greater rate of flow. The relationship can be expressed as: I = nAvQ, where:

• I is the electric current
• n is the number of charge carriers per unit volume
• A is the cross-sectional area of the conductor
• Q is the magnitude of the charge on each carrier