Current Electricity
Uttar Pradesh Board · Class 12 · Physics
Quick revision notes for Current Electricity — Uttar Pradesh Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Electric Current
- Electric current is the rate of flow of electric charge through a conductor
- Current flows from positive to negative terminal in external circuit
- Conventional current direction is opposite to electron flow
Electric Current in Conductors
- Free electrons in metals act as charge carriers
- Without electric field: random thermal motion, no net current
- With electric field: electrons drift towards positive terminal
Ohm's Law
- Fundamental law relating voltage, current, and resistance
- V ∝ I or V = IR (for ohmic materials)
- R depends on material and dimensions of conductor
Drift Velocity and Current
- Drift velocity: average velocity of charge carriers under electric field
- Much smaller than thermal velocity of electrons
- Current density J = nqvd
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Current Electricity covers several key topics that are frequently asked in Uttar Pradesh 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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