| p, symbol for instantaneous power | AC Resistor Circuits |
| | AC Resistor Circuits |
| P, symbol for power | Power in electric circuits |
| | DC circuit equations and laws |
| package | Package TO-18 |
| | Package TO-3 |
| | Package TO-39 |
| | Package TO-5 |
| | Package TO-66 |
| | Package TO-72 |
| | Package TO-254AA |
| Pair, differential | Differential amplifier |
| | Simple op-amp |
| PALASM | Introduction |
| Paper tape storage | Memory with moving parts: "Drives" |
| Parallel | Parallel batteries |
| | Rheostat range limiting |
| Parallel analysis | Parallel R, L, and C |
| Parallel circuit rules | Simple parallel circuits |
| | What is a series-parallel circuit? |
| | Series R, L, and C |
| Parallel circuits | Series and parallel component equivalent values |
| Parallel data | Introduction |
| | Shift Register, Parallel-in, Serial-out |
| parallel LC resonance | Simple parallel (tank circuit) resonance |
| Parallel, definition of | What are "series" and "parallel" circuits? |
| parallel-in/parallel-out shift register | Parallel-In, Parallel-Out, Universal Shift Register |
| | PIPO Universal Devices |
| Paramagnetism | Permanent magnets |
| particle | Static electricity |
| | Electron activity in chemical reactions |
| PASCAL, computer language | Using the Spice Circuit Simulation Program |
| Passive averager | Averager and summer circuits |
| Passive device | Active versus passive devices |
| Pauli exclusion principle | Pauli exclusion principle |
| PC/AT bus | Short-distance busses |
| pcb | Resistors |
| | Building simple resistor circuits |
| | Low-Pass Filters |
| | Meter check of a diode |
| PCI | Short-distance busses |
| PCMCIA | Short-distance busses |
| pCO2 | pH measurement |
| Peak | Measurements of AC magnitude |
| peaking transformer | Core saturation |
| Peltier effect | Thermocouples |
| Pendulum | An electric pendulum |
| Pentagrid tube | Combination tubes |
| Pentode tube | Depletion-type IGFETs |
| period | AC Waveforms |
| Periodic table | Periodic Table of the Elements |
| Permanent magnet | Permanent magnets |
| permanent magnet moving coil | AC Voltmeters and Ammeters |
| Permanent Magnet Moving Coil meter movement | What is a meter? |
| permeability | Factors affecting inductance |
| | Magnetic units of measurement |
| | Variable inductor |
| Permissive switch | Permissive and interlock circuits |
| Permittivity | Electric fields and capacitance |
| | Factors affecting capacitance |
| Permittivity, relative | Characteristic impedance |
| Perpetual motion machine | Superconductivity |
| | Amplifiers |
| Peta | Metric notation |
| pH | pH measurement |
| Phase | AC Phase |
| Phase rotation | Phase rotation |
| Phase sequence | Phase rotation |
| phase shift | AC Capacitor Circuits |
| | AC Inductor Circuits |
| | AC Phase |
| | Phase shift |
| Phase shift, vector | Vectors and AC waveforms |
| Phase, transformer | Phasing |
| phase-continuous FSK | Electrical signal types |
| Photodiode | Photodiodes |
| Photoelectric effect | Special-purpose batteries |
| Photon | Optical data communication |
| Physics, quantum | Introduction |
| physiological effects of electricity | Physiological effects of electricity |
| piano | AC Waveforms |
| Pico | Metric notation |
| piezoelectricity | Frequency and phase measurement |
| Pinch-off voltage | The transistor as a switch |
| PIPO shift register | Parallel-In, Parallel-Out, Universal Shift Register |
| pitch (musical) | AC Waveforms |
| PIV rating | Diode Characteristic |
| Place value | Systems of numeration |
| Place value, numeration system | Systems of numeration |
| Plasma | Ionization (gas-filled) tubes |
| | Gas discharge tubes |
| Platter, hard disk | Memory with moving parts: "Drives" |
| Playte | Bit groupings |
| PLC | Programmable logic controllers |
| PMMC | AC Voltmeters and Ammeters |
| PMMC meter movement | What is a meter? |
| pn junction | pn-Junction as Temperature Sensor |
| PNPN diode | The Shockley Diode |
| pO2 | pH measurement |
| Point, binary | Decimal versus binary numeration |
| Point, decimal | Decimal versus binary numeration |
| Point-to-point topology | Network topology |
| Points, electrically common | Circuit wiring |
| | Shock current path |
| Polar notation | Polar and rectangular notation |
| Polarity | Voltage and current |
| | Voltmeter usage |
| | A Very Simple Circuit |
| Polarity, AC | Single-phase power systems |
| | More on AC "polarity" |
| | Some examples with AC circuits |
| Polarity, voltage | Polarity of voltage drops |
| polarized | Conventional versus electron flow |
| | Practical considerations |
| Pole, alternator | Three-phase power systems |
| Poles, switch | Contact "normal" state and make/break sequence |
| Polyphase | Three-phase power systems |
| polyphase bridge rectifier | Rectifier circuits |
| polyphase induction motor | Tesla Polyphase Induction Motors |
| | Construction |
| | Theory of operation |
| | Motor starting and speed control |
| | Linear induction motor |
| POS | Larger 4-variable Karnaugh maps |
| POS expression | Converting truth tables into Boolean expressions |
| positive charge | Static electricity |
| positive feedback | Positive feedback |
| | Hysteresis |
| | Feedback |
| | Logic signal voltage levels |
| Positive sequence | Harmonic phase sequences |
| Potential energy | Voltage and current |
| potential transformer | Special transformers and applications |
| | AC Voltmeters and Ammeters |
| | Protective relays |
| potentiometer | Resistors |
| | Voltage divider circuits |
| | AC Instrumentation Transducers |
| | Potentiometer as a voltage divider |
| Potentiometer as rheostat | Potentiometer as a rheostat |
| Potentiometer, as voltage divider | Voltage divider circuits |
| Potentiometer, linear vs. audio taper | Potentiometer as a voltage divider |
| Potentiometer, precision | Voltage divider circuits |
| Potentiometric voltmeter | Potentiometric voltmeter |
| powdered iron core | Energy losses |
| power | True, Reactive, and Apparent power |
| power calculations | Calculating Electric Power |
| power capacity | Power capacity |
| power dissipation | Transistor Ratings |
| Power factor | AC Circuit Equations |
| | Power in resistive and reactive AC circuits |
| Power factor meter | Practical power factor correction |
| Power quality | Power quality measurement |
| Power quality meter | Power quality measurement |
| Power supply | Introduction |
| Power triangle | True, Reactive, and Apparent power |
| Power, definition | Power dissipation |
| power, electric | Power in electric circuits |
| Power, general definition | Why L/R and not LR? |
| Power, in series and parallel circuits | Power calculations |
| power, negative | AC Inductor Circuits |
| power, precise definition | Power in electric circuits |
| prefix | Ohmmeter usage |
| Prefix, metric | Metric prefixes and unit conversions |
| pressure switch | Switch types |
| primary cell | Electron activity in chemical reactions |
| primary coil | Mutual inductance and basic operation |
| primary transformer coil | What is alternating current (AC)? |
| Principal mode | Waveguides |
| principal quantum number | Principal Quantum Number |
| printed circuit board | Resistors |
| | Building simple resistor circuits |
| | Low-Pass Filters |
| | Meter check of a diode |
| Process variable | Analog and digital signals |
| | Single-ended and differential amplifiers |
| Processor, computer | Microprocessors |
| product term | Making a Venn diagram look like a Karnaugh map |
| Product-Of-Sums | Larger 4-variable Karnaugh maps |
| Product-Of-Sums expression | Converting truth tables into Boolean expressions |
| Profibus | Extended-distance networks |
| Program, self-modifying | Microprocessors |
| Programmable Logic Controller | Programmable logic controllers |
| Programmable op-amp | Simple op-amp |
| Programming language, high level | Microprocessor programming |
| Programming, SPICE | Using the Spice Circuit Simulation Program |
| PROM | Read-only memory |
| Propagation delay | Edge-triggered latches: Flip-Flops |
| propagation delay, shift register | Shift Register, Serial-in/Serial-out |
| Properties, arithmetic | Algebra Reference |
| Properties, exponents | Algebra Reference |
| Properties, radicals | Algebra Reference |
| Property, associative | Boolean algebraic properties |
| Property, commutative | Boolean algebraic properties |
| Property, distributive | Boolean algebraic properties |
| Protective relay | Protective relays |
| protocol | Network protocols |
| proton | Static electricity |
| | Scientific notation |
| | Electron activity in chemical reactions |
| | Quantum physics |
| | Pauli exclusion principle |
| | Quantum Mechanics |
| Proton, mass of | Scientific notation |
| proximity switch | Switch types |
| pseudo-noise | Introduction to Shift Registers |
| PT | Special transformers and applications |
| | AC Voltmeters and Ammeters |
| | Protective relays |
| Pull-in current | Relay construction |
| Pulldown resistor | LED sequencer |
| Pullup resistor | CMOS gate circuitry |
| Pulse stretching | Optical data communication |
| Pulse-width modulation | The "operational" amplifier |
| | PWM power controller |
| push-pull amplifier | Biasing techniques |
| pushbutton switch | Switch types |
| PUT | The Unijunction Transistor |
| PWM | The "operational" amplifier |
| PWM power control | PWM power controller |
| Pythagorean Theorem | Trigonometry Reference |