AC Circuits — Class 12 Maharashtra HSC Physics revision notes
A 5-page visual revision sheet for AC Circuits, written for Class 12 Maharashtra HSC 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 AC Circuits sheet covers
- AC source
- Instantaneous current
- RMS value
- average value
- Average and RMS value, said precisely
- phasor
- Phasors
- AC through R, L, C alone
- Resistor
- Inductor
- Capacitor
- impedance
- lcr circuit
- Impedance of a series LCR circuit
- voltage across each element, same current i throughout
- e_L and e_C are 180 degrees out of phase, so they subtract
- dividing through by i_0 gives the impedance
- phase angle by which emf leads current
- power factor
- wattless current
- Power in an AC circuit
- average power over a full cycle
- power factor, from the impedance triangle
- pure R, non-inductive circuit, X_L=X_C
- pure L or pure C alone
- lc oscillations
- Series vs parallel resonance
- Series vs parallel resonant circuit
- Series (acceptor)
- Parallel (rejector)
- q factor
- quality factor
- bandwidth
- Sharpness of resonance, the Q factor
- half-power points, symmetric about the resonant angular frequency
- bandwidth, current falls to 1/√2 of peak at its edges
- choke coil
- Symbols
- 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 AC Circuits 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.
More Physics Class 12 revision notes
- Current Electricity
- Dual Nature of Radiation and Matter
- Electromagnetic Induction
- Electrostatics
- Kinetic Theory of Gases and Radiation
- Magnetic Fields due to Electric Current
- Magnetic Materials
- Mechanical Properties of Fluids
- Oscillations
- Rotational Dynamics
- Semiconductor Devices
- Structure of Atoms and Nuclei
- Superposition of Waves
- Thermodynamics
- Wave Optics