Equation 4 · Part 1 · Edge AI Electronics and Sensor Systems in Practice: An Advanced Technical Guide

Symbol P_i

P_i

P_i

What this part means

the measured — not datasheet-typical — power draw in that state.

Its job in the formula

$P_i$ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol P_iArticle meaning

Where the article explains it

Here $f_i$ is the fraction of time the device spends in power state i (sleep, always-on monitoring, escalated inference, radio) and $P_i$ is the measured — not datasheet-typical — power draw in that state.

The passage around this formula

Here $f_i$ is the fraction of time the device spends in power state i (sleep, always-on monitoring, escalated inference, radio) and $P_i$ is the measured — not datasheet-typical — power draw in that state. This formulation is worth writing out because it exposes the one lever that dominates every other design decision: since $f_{\text{sleep}}$ is normally close to one and $P_{\text{sleep}}$ is normally the smallest term, the average…

Read this part in the article →

Learn the underlying idea

A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

Open the illustrated subscripts: which member of a family? guide →

See this notation across published equations →

Sources cited in the article section

These citations provide research context; check each source for the exact claim it supports.