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{{term|[[peak demand]]}}{{defn|The maximum rate at which energy is consumed from an electrical grid; may be either an instantaneous measure or the maximum energy transferred in some interval such as 15 minutes.}}
{{term|[[Peltier–Seebeck effect]]}}{{defn|The thermoelectric effect, movement of heat due to electric current flow.}}
{{term|[[pentagrid converter]]}}{{defn|A type of self
{{term|[[pentode]]}}{{defn|Any five-electrode electron device, but usually a kind of vacuum tube.}}
{{term|[[permanent magnet synchronous generator]]}}{{defn|An AC generator that uses a permanent field magnet instead of an electromagnet.}}
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{{term|[[proximity effect (electromagnetism)|proximity effect]]}}{{defn|The increase in circuit resistance when the magnetic fields of multiple AC currents interact.}}
{{term|[[pulse transformer]]}}{{defn|A transformer designed to create or transmit pulses.}}
{{term|[[pulse-width modulation]]}}{{defn|Transmission of information by varying the duration of pulses, or, varying the average output voltage of a power converter by varying the duration of pulses.}}
{{term|[[pulse-amplitude modulation]] (PAM)}}{{defn|Transmission of information by varying the magnitude of a stream of pulses of fixed frequency.}}
{{term|[[pulse-code modulation]]}}{{defn|Any system for conveying analog information by altering some property of a stream of pulses.}}
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