Current Electricity
Maharashtra Board · Class 12 · Physics
Quick revision notes for Current Electricity — Maharashtra Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Kirchhoff's Laws
- Junction (Node): Point where two or more conductors meet
- Loop (Mesh): Any closed conducting path in a circuit
- Branch: Part of circuit between two junctions
Wheatstone Bridge
- Four resistors P, Q, R, S arranged in quadrilateral form
- Battery connected across one diagonal (AC)
- Galvanometer connected across other diagonal (BD)
Potentiometer
- Consists of long uniform wire with constant current
- Potential gradient K = V/L (constant along wire)
- Acts as ideal voltmeter (draws no current at balance)
Galvanometer and Its Conversions
- Detects small currents (typically μA to mA range)
- Has moderate resistance (~100Ω) and limited current capacity
- Conversion to ammeter: Add low resistance shunt in parallel
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Current Electricity covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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