← All parts of this equation

Equation 3 · Part 1 · Edge AI Electronics and Sensor Systems in Practice: An Advanced Technical Guide

Symbol i

ii
ii

What this part means

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

Its job in the formula

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

The passage around this formula

Here fif_i is the fraction of time the device spends in power state i (sleep, always-on monitoring, escalated inference, radio) and PiP_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 fsleepf_{\text{sleep}} is normally close to one…

Read this part in the article →

Learn the underlying idea

A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

Open the illustrated variables: a letter stands for a value 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.