Pad-mount transformer – Padmount transformer – Pantograph (rail) – Paraformer – Paraformer – Parameter estimation – Park transform – Park's transformation – Partial discharge – Passivity (engineering) – Patch cables – Peak demand – Pearl Street Station – Peltier–Seebeck effect – Pentagrid converter – Pentode – Permanent magnet synchronous generator – Permanent magnet – Permeability (electromagnetism) – Personal computer – Personal digital assistant – Perturbation theory – Petroleum – pH meter – Phase (waves) – Phase angle – Phase converter – Phase-fired controllers – Phase locked loop – Phase modulation – Phasor (electronics) – Phasor measurement unit – Phasor – Phonograph – Photocell – Photodetector – Photodiode – Photometer – Photonics – Photoresistor – Phototransistor – Physics – Physis – PID controller – Piezoelectric effect – Piezoelectric motor – Pigovian tax – PIN diode – Pirelli – Planar graph – Plasma (physics) – Plenum cable – Plug-in hybrid – P-N junction – Polarization density – Polyethylene – Polymer – Polyphase coil – Polyphase system – Polypropylene – Polytetrafluoroethylene – Pontryagin's minimum principle – Port (circuit theory) – Positive feedback – Potential difference – Potentiometer – Potentiometers – Power – Power BJT – Power cable – Power conditioner – Power consumption – Power converter – Power distribution – Power electronics – Power engineering – Power-factor correction – Power factor – Power-flow study – Power generation – Power grid – Power inverter – Power inverter – Power-line carrier communication – Power-line communication – Power MOSFET – Power plant – Power rating – Power quality – Power station – Power storage – Power supplies – Power-system automation – Power-system protection – Precious metal – Pressure – Printed circuit board – Printer (computing) – Process control – Product lifecycle management – Product safety – Professional communication – Professional engineer – Programmable logic controller – Programming language – Project management – Projection (mathematics) – Prolec GE – Protective relay – Proximity effect (electromagnetism) – Pulse transformer – Pulse-width modulation – Pulse-amplitude modulation (PAM) – Pulse-code modulation – Pumped-storage hydroelectricity – Push switch – Push–pull converter –