Why use conductance instead of resistance?

Conductance simplifies parallel circuit analysis—conductances add directly like resistances in series. It's also more intuitive for some applications: higher conductance = more current flow. Water quality meters use conductivity (conductance per length) because dissolved ions increase conduction.

How do I convert resistance to conductance?

Simply take the reciprocal: G = 1/R. 100 Ω = 0.01 S = 10 mS. 1 kΩ = 0.001 S = 1 mS. 1 MΩ = 0.000001 S = 1 μS.

What is transconductance?

Transconductance (gm) measures how much output current changes per unit input voltage change in active devices like transistors: gm = ΔI_out/ΔV_in. Units are siemens. Higher gm means more gain. It's a key parameter for amplifier design.

電気コンダクタンス Converter

About Electric Conductance Conversion

Electric conductance is the reciprocal of resistance—it measures how easily current flows through a component. High conductance means low resistance and easy current flow. While resistance asks "how much does this oppose current?", conductance answers "how readily does current pass through?" This inverse relationship (G = 1/R) makes conductance particularly useful when analyzing parallel circuits, where conductances add directly rather than requiring the complex reciprocal formula needed for parallel resistances.

The SI単位 is the siemens (S), equal to one ampere per volt (A/V). The older term mho (ohm spelled backwards, sometimes written with the inverted omega symbol ℧) equals one siemens and remains in common use. Conductance appears throughout electronics: transistor transconductance measures amplification capability, solution conductance indicates ionic content, and membrane conductance describes ion channel behavior in biology. Conductance is especially valuable in parallel circuit analysis, semiconductor characterization, electrochemistry, and bioelectrical measurements.

Our converter handles all standard electric conductance units from kilosiemens down to picosiemens.

Common Electric Conductance Conversions

変換元	変換先	乗数
S	mho	1 (equivalent)
S	mS	1,000
mS	S	0.001
S	μS	10⁶
μS	S	10⁻⁶
mS	μS	1,000
S	kS	0.001
μS	nS	1,000

Electric Conductance 単位リファレンス

Siemens (S) – The SI単位 of electrical conductance, named after German inventor Werner von Siemens. 1 S = 1 A/V = 1/Ω. A 1-siemens conductance passes 1 ampere when 1 volt is applied. In practical circuits, components typically have conductances in the milliSiemens to microSiemens range—a 1 kΩ resistor has conductance of 1 mS, while a 1 MΩ resistor has conductance of 1 μS.

Mho (℧) – The historical name for siemens, created by spelling "ohm" backwards. 1 mho = 1 S exactly. The inverted omega symbol (℧) was used to distinguish it from the ohm symbol (Ω). While officially replaced by siemens in 1971, "mho" remains in common use among practicing engineers and in American industry terminology.

Millisiemens (mS) – 10⁻³ S, convenient for moderate conductances. Common for electrolyte solutions, transistor transconductance values, and circuit analysis. A typical small-signal transistor might have transconductance of 10-50 mS. Equivalent to 1 mS = 1 kΩ resistance.

Microsiemens (μS) – 10⁻⁶ S, the standard unit for water quality and low-conductance measurements. Pure water: ~0.055 μS/cm (at 25°C). Distilled water: 0.5-3 μS/cm. Drinking water: 50-500 μS/cm. Also used for high-resistance semiconductor characterization and biological membrane studies. Equivalent to 1 μS = 1 MΩ resistance.

Nanosiemens (nS) – 10⁻⁹ S, used for very low conductances such as individual ion channels in cell membranes (1-100 nS typical) and high-precision resistance standards. 1 nS = 1 GΩ resistance. Important in neuroscience and biophysics.