Current Electricity — Class 12 ISC Physics revision notes
A 5-page visual revision sheet for Current Electricity, written for Class 12 ISC Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
What this Current Electricity sheet covers
- Current, drift and the microscopic picture
- Ohm's law, resistance and resistivity
- Ohm's law
- resistance from geometry
- resistivity, microscopically
- current density
- with temperature
- power
- What temperature does, and to whom
- Where Ohm's law fails
- Cells, EMF and internal resistance
- terminal voltage on discharge
- terminal voltage on charging
- current in a simple circuit
- cells in series
- n identical cells in parallel
- maximum power transfer
- Series and parallel, and what each preserves
- Kirchhoff's rules
- The Wheatstone bridge
- The potentiometer
- Galvanometer, ammeter and voltmeter
- Heating and power
- Combinations of cells, chosen sensibly
- Why a null method beats a deflection method
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Current Electricity the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.