Ohm is the unit of electrical resistance. Just kidding ... This is why most list their power ratings at 8 ohms as well (i.e. "100 watts at 8 ohms"), but most won't have a problem if the speaker ...

The symbol for resistance is R, it is measured in ohms \((\Omega )\). The symbol for current is I, it is measured in amperes \((A)\).

Hence, for a metal, resistance increases with increasing temperature. Often the increase in temperature is caused by an increase in current. An example is a filament lamp. As current increases ...