0 a unit for measuring electrical resistance -- ohm
Two 100 ohm resistors in parallel have an equivalent resistance of 50 ohms.
The antenna has very low radiation resistance (less than one ohm) and will rarely be utilized for transmitting.
A matching transformer should be inserted between any such low-impedance transmission line and the higher 470 ohm impedance of the antenna.
This high-frequency resistance may vary over a wide range (from 0.1 ohm to 10 k in some cases; the useful range is smaller, though).
The 1893 system had three base units: the international ampere, the international ohm and the international volt.
Electron mobility measurements surpassing one million correspond to a sheet resistance of one ohm per square -- two orders of magnitude lower than in two-dimensional graphene.
These probes are also called resistive divider probes, since a 50 ohm transmission line presents a purely resistive load.
Impedances are 75 ohm single-ended, and 150 ohm differential.
The definition of the ohm unit was revised several times.
