Electric current and voltage are fundamental concepts in electricity:
1. **Electric Current:**
- **Definition:** Electric current is the flow of electric charge. It is the rate at which electric charges (usually electrons) move through a conductor.
- **Symbol:** Represented by the symbol 'I'.
- **Unit:** Measured in amperes (A).
- **Direction:** Flows from higher potential to lower potential (conventional current), but in reality, it involves the movement of electrons from lower potential to higher potential.
2. **Voltage:**
- **Definition:** Voltage, also known as electric potential difference, is the force that drives electric current. It is the energy required to move a unit charge from one point to another in an electric field.
- **Symbol:** Represented by the symbol 'V' or 'E'.
- **Unit:** Measured in volts (V).
- **Role:** Voltage provides the "push" or potential energy that drives the flow of electric current through a conductor.
