The droning voice of the professor continued to wind itself slowly round and round the coils it spoke of, doubling, trebling, quadrupling its somnolent energy as the coil multiplied its ohms of resistance.
There are no more uses of "ohm" in the book.
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That 8-ohm resistor is rated 20 watts.
Louise Rennison -- Angus, Thongs and Full-Frontal Snogging