Current Electricity
Kerala Board · Class 12 · Physics
Quick revision notes for Current Electricity — Kerala Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Electric Current and Ohm's Law
- Electric current is the rate of flow of electric charge through a cross-sectional area
- Conventional current direction is opposite to electron flow direction
- Current flows only in closed circuits with potential difference
Grouping of Resistors
- Series combination: Same current through all resistors, different potential differences
- Parallel combination: Same potential difference across all resistors, different currents
- Series equivalent resistance is sum of individual resistances
Kirchhoff's Rules and Circuit Analysis
- Kirchhoff's Current Law (KCL): Sum of currents entering a junction equals sum leaving
- Kirchhoff's Voltage Law (KVL): Sum of potential differences around closed loop is zero
- KCL is based on conservation of charge, KVL on conservation of energy
Wheatstone Bridge
- Wheatstone bridge is used for accurate measurement of unknown resistance
- Bridge is balanced when no current flows through galvanometer
- Balance condition: P/Q = R/S or PS = QR (product of opposite arms equal)
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Current Electricity covers several key topics that are frequently asked in Kerala 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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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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