vault backup: 2026-04-14 17:14:20

alternating-current.md

@@ -23,6 +23,12 @@ dg-publish: true
 * Ungrounded conductor - "Hot"
 * Grounded conductor - "Neutral"
 
+## Impedance
+
+[resistance](https://en.wikipedia.org/wiki/Electrical_resistance)
+[reactance](https://en.wikipedia.org/wiki/Electrical_reactance)
+[impedance](https://en.wikipedia.org/wiki/Electrical_impedance)
+
 ## 3-Phase Power
 
 The conductors between a voltage source and a load are called lines,

timestamped/2026-04-14_15-50-06.md

@@ -0,0 +1,44 @@
+---
+id: 2026-04-14T15:50:06-04:00
+aliases: []
+title: 2026-04-14 15:50:06
+tags:
+  - authorship/original
+  - destiny/permanent
+  - status/draft
+  - type/periodic/timestamped
+dg-publish: true
+date-created: 2026-04-14T15:50:06-04:00
+daily: "[[2026-04-14]]"
+weekly: "[[2026-W16]]"
+monthly: "[[2026-04]]"
+quarterly: "[[2026-Q2]]"
+yearly: "[[2026]]"
+---
+# 2026-04-14 15:50:06
+
+## Conductance
+
+**Conductance** is the reciprocal of [resistance](https://en.wikipedia.org/wiki/Electrical_resistance).
+
+The SI unit of conductance ($G$)
+is the [siemens](https://en.wikipedia.org/wiki/Siemens_(unit)) (S).
+"Mho" (ohm backwards) is an unofficial name and should be avoided.
+
+Like the ohm is also the unit of [reactance](https://en.wikipedia.org/wiki/Electrical_reactance) ($X$)
+and [impedance](https://en.wikipedia.org/wiki/Electrical_impedance) ($Z$),
+the siemens is also the unit of [susceptance](https://en.wikipedia.org/wiki/Electrical_susceptance) ($B$)
+and [admittance](https://en.wikipedia.org/wiki/Admittance) ($Y$),
+their respective reciprocals.
+
+***
+
+For my purposes,
+conductance is generally a far more practical quantity than resistance,
+owing to that it increases with wire area and cost like ampacity.
+
+> [!info] Ohm's Law In Terms of Conductance
+>
+> $$
+> V = \frac{I}{G}, \quad G = \frac{I}{V}, \quad I = G \times V
+> $$

voltage-drop.md

@@ -103,13 +103,25 @@ where
 
 ***
 
-It is often more useful to know the maximum length
+When exact length is unknown,
+it is often most useful to calculate the maximum length
 a certain wiring configuration is suitable for.
 
 $$
 L = \frac{ \Delta V }{ I \times M } \times \frac{1}{Z}
 $$
 
+where
+* $M$ is the "phase multiplier" (2 for single phase, $\sqrt{3}$ for 3-phase)
+* $Z$ is the linear resistance of the wiring configuration
+
+***
+
+When exact length is known,
+it is often most useful to calculate the linear resistance
+that will result in a specified voltage drop,
+the maximum linear resistance for a specific feeder.
+
 $$
 Z = \frac{ \Delta V }{ I \times M \times L }
 $$