9 resources.
Young's double slit experiment: path difference, bright and dark fringes, fringe width, the intensity formula, worked examples in air and water, and common mistakes.
Kirchhoff's current and voltage laws with a sign-convention table, a worked two-loop circuit, the balanced Wheatstone bridge, and common mistakes.
How a PN junction works in forward and reverse bias, the diode equation and the 60 mV per decade rule, a diode in a simple circuit, rectifiers, and common mistakes.
Single-slit minima and the width of the central maximum, the diffraction grating and its highest order, a comparison with the double slit, and common mistakes.
Einstein's photoelectric equation, stopping potential, what depends on intensity vs frequency, worked examples on threshold wavelength and work function, and common mistakes.
The de Broglie wavelength in every form, the 1.227/√V nm electron shortcut, worked examples for an electron, a cricket ball and a proton vs alpha particle, and common mistakes.
Thevenin's and Norton's theorems step by step, a worked reduction with a short-circuit cross-check, solving for a load, maximum power transfer, and common mistakes.
BJT regions of operation, fixed bias with a worked example, why a change in beta moves the Q-point, voltage-divider bias, and common mistakes.
Ideal op-amp rules, inverting and non-inverting amplifiers compared, the voltage follower, a summing amplifier, and common mistakes, with worked examples.