diff --git a/src/IIPAU.jl b/src/IIPAU.jl
index 4a23955..42b4e6a 100644
--- a/src/IIPAU.jl
+++ b/src/IIPAU.jl
@@ -28,7 +28,9 @@ export to₆
 export wave_number
 
 export span, tick, egg, spark, lotta, alotta, brr
-export ball, touch, jolt
+export ball, touch, jolt, cell, wire
+
+export wg
 
 function __init__()
     Unitful.register(IIPAU)
@@ -46,10 +48,10 @@ brr = 1@unit bʳ "bʳ" Brr (Natural.ΔEₕ / Natural.hexit) false # ~0.04K
 
 # Derived Units
 ball = 1@unit ḃ "ḃ" Ball ((π/6)*span^3) false # ~5L (sphere of diameter 1ṡ)
-touch = 1@unit ṫ "ṫ" Touch (egg * span / tick ^2) false # ~0.1N (10grams of weight)
+touch = 1@unit ṫ "ṫ" Touch (egg * span / tick^2) false # ~0.1N (10grams of weight)
 jolt = 1@unit j "j" Jolt (spark / tick) false # ~0.04A
 cell = 1@unit ċ "ċ" Cell (span * touch / spark) false # ~1.1V (just shy of zinc/copper electrode)
-# TODO: resistance is at about 26.6Ω
+wire = 1@unit w "w" Wire (span^2 * egg / spark^2 / tick) false # ~26.6Ω almost exactly 1 kile span of b6"2e-3"-span diameter copper wire (especially if the copper has some impurities)
 
 # Convenience Units
 instant = 1@unit i "i" Instant (b6"3e-2" * tick) false # ~5ms (300₆ instants to a tick)
@@ -58,7 +60,17 @@ wait = 1@unit ẇ "ẇ" Wait (b6"300" * pause) false # ~100 minutes
 
 # Useful references
 resistance_of_wire(ρ, L, d) = ρ * L / (π * (d/2)^2)
-# Note: 1 kile span of 1 mille span diameter silver wire has a resistance of about 210Ω
+ρAg = 1.59e-8u"Ω*m"
+ρCu = 1.68e-8u"Ω*m"
+
+gauge = 1@unit WG "WG" WireGauge (b6"1e-4" * span) false
+wg(n) = 3 * span * 6.0^(-n/6) # wg(24) is the gauge for the wire unit
+wgo(n) = resistance_of_wire(ρCu, kile * span, wg(n))
+ρIdealWire = wire * π * (wg(24) / 2)^2 / (kile * span) |> u"m * Ω"
+
+# temporary definition of american wire gauge:
+awg(n) = 0.127u"mm" * 92^((36-n)/39)
+
 
 #egg = 1@unit e "e" Egg (b6"1e53" * (Unitful.mp + Unitful.me)) false # ~80g