Unit of Resistance
The unit of electrical resistance is Ohm (symbol Ω) named after German physicist Georg Simon Ohm.
Related reading: Ohm's Law, Resistance in Parllel and Series combinations
Wave Particle Duality
Matter exists in both wave nature and the particle nature at any given time.
Related reading: Heisenberg's Uncertainity Principle
Power Formula
The power, p, delivered by a circuit is given by the formula P = (I^2)R
Related reading: Joule's Law of Heating
Unit of Frequency
The unity of frequency is hertz, named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves
Related reading: Waves, Oscillations
Photon
2 aspects to the joke. First that photons make light. Second that phonts are massless
Related reading: Wave Theory of Light, Dual Nature of Radiation
Plank in Physics v/s Common term
Honestly, this isn't a very academic joke. It's simply based on the sound/word 'Plank'. To a normal person it'll mean the exercise plank, but to a physics students it refers to the Planck's constant.
Related reading: Wave Theory of Light, Dual Nature of Radiation