Electric current

Electric current is the flow of electrons through a conductor. *Key Points* 1. *Definition*: Electric current is defined as the rate of flow of charge. 2. *Unit*: The unit of electric current is ampere (A). 3. *Types of Current*: There are two types of electric current: 1. *Direct Current (DC)*: Flows in one direction only. 2. *Alternating Current (AC)*: Changes direction periodically. 4. *Current Density*: Current density is the current per unit area of the conductor. 5. *Ohm's Law*: Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, provided the temperature remains constant. *Important Formulas* 1. *I = Q/t*: Current (I) is equal to the charge (Q) divided by time (t). 2. *I = V/R*: Current (I) is equal to the voltage (V) divided by resistance (R). *Important Terms* 1. *Conductor*: A material that allows the flow of electric current. 2. *Insulator*: A material that does not allow the flow of electric current. 3. *Resistance*: The opposition to the flow of electric current. This summary covers the key points, formulas, and terms related to electric current for Class 12.