Electrical & Power

Where a voltage signal sits in its configured span. Defaults to 0–10 V. Not clamped.

Voltage across a 250 Ω HART / PLC current-loop resistor.

Voltage drop across series loop devices and remaining supply voltage.

Raw PLC counts that represent 4–20 mA, then the configured engineering pressure.

Linear transmitter current to process value. Engineering fields are pressure; use generic linear scaling for other quantities.

Where a live-zero current sits in its configured span. Over/under-range is not clamped.

Power factor from measured real and apparent power, or from P, V, and I.

Unipolar ADC: V = counts × Vref / (2^N − 1). Endpoints are 0 and full-scale.

Loop voltage drop, remaining headroom, and how the installed resistance compares with Rmax at 20 mA (INST-10).

Contextual interpretation of a measured vehicle battery voltage.

Resulting voltage, capacity, and energy for identical batteries in series and parallel.

Estimate charging time from capacity, SOC window, and charge current.

Estimate how long a battery can operate a load.

How much conductor that resistance represents — leftover on a spool, or length of a linear-anode header.

Conductor resistance from resistivity, length, and cross-sectional area.

Voltage drop from cable current and resistance.

Convert between conductivity and resistivity.

COP = useful thermal power / electrical input. EER = (Btu/h of cooling) / (W electrical) = COP × 3.412.

Current density from current and exposed or active area.

Two-wire DC voltage drop from one-way length and conductor resistance per unit length.

Power dissipated in wiring, Ethernet PoE loops, or another resistive element.

Energy consumed by a constant load over time.

Expected transmitter current for a known process pressure.

Heat to the airstream = electrical input × heat-to-air fraction. The fraction is required — motors do not dump 100% into the duct by default.

Series resistor and dissipation for an LED or other voltage-dependent load.

Convert between voltage, current, and power for a DC, PoE, or unity-PF load.

Where a measured loop current sits relative to live zero/full scale, with NAMUR-style band context — not a device verdict.

Maximum series resistance a 4–20 mA loop can tolerate at full-scale current.

Solve for voltage, current, resistance, or power from any two of the four.

Combine two or more resistances in parallel.

Resistance per unit length of the pipe metal from electrical resistivity and metal cross-section. Not soil resistivity or coating conductance.

Total metal resistance of a pipeline from linear resistance and length.

Whether a PoE source budget covers connected PD loads. Not a PoE class lookup.

Effective operating circuit resistance from DC voltage and current. For a shunt millivolt rating, use Shunt Value.

Convert between rectifier DC voltage, current, and power.

DC output power as a fraction of AC input power.

Calculate conductor resistance from resistivity, length, and area.

Sum two or more resistances in series.

Current from measured shunt voltage and known shunt resistance.

Shunt resistance from measured voltage and current.

Shunt measurement from millivolt drop and current. Same Ohm’s-law math as Rectifier Circuit Resistance, labeled for shunt work.

Voltage drop across a shunt from current and resistance. Display in mV or V.

Real, apparent, and reactive power for a single-phase AC load.

Estimate daily energy production from a PV array.

Balanced three-phase power from line-to-line voltage and line current.

Calculate voltage drop or IR drop from current and resistance.

Nearest integer count using round-half-away-from-negative-infinity (ECMA Math.round).