Current Electricity
Current Electricity is one of the most scoring chapters in JEE Main Physics.
This chapter covers electric current, drift velocity, resistance, Kirchhoff’s laws, Wheatstone bridge,
meter bridge, potentiometer, and electrical circuits. Strong command over formulas and circuit analysis
helps in solving numerical questions quickly.
Topics Covered
- Electric Current and Current Density
- Drift Velocity and Mobility
- Ohm’s Law
- Resistance and Resistivity
- Temperature Dependence of Resistance
- Series and Parallel Combination of Resistors
- Electromotive Force and Internal Resistance
- Kirchhoff’s Current Law (KCL)
- Kirchhoff’s Voltage Law (KVL)
- Wheatstone Bridge
- Meter Bridge
- Potentiometer
Important Formulas
Current:
I = Q / t
Ohm’s Law:
V = IR
Resistance:
R = ρL / A
Drift Velocity:
I = nAeVd
Electrical Power:
P = VI = I²R = V²/R
JEE Main Preparation Tips
- Practice circuit-solving using Kirchhoff’s laws.
- Memorize bridge balancing conditions.
- Focus on potentiometer-based numerical problems.
- Solve previous year JEE Main questions for speed improvement.
