Don's bulbs
rare light bulbs and lamps
glossary of termsinformation
definition of: OHM

What is OHM?

The amount of resistance of a filament.

The thinner and longer a filament, the more resistant (the higher the ohm value).

Short thick filaments have very low resistance.

Tungsten filaments gain resistance the hotter they get.

Cold filaments have low resistance.

The ohm is named after Georg Simon Ohm, a high school teacher in Cologne, in year 1825.

references for this page: OHMS, OHM, RESISTANCE