Ohm/əʊm/ Definition 1 of 1Pro Tip 1/3Pronunciation Pronounced like 'home' without the 'h', stress on the first and only syllable. The reading on the device was 50 ohms. Pro Tip 2/3Singular/Plural 'Ohm' remains the same in singular and plural; context indicates number. This speaker has an impedance of 8 ohms. Pro Tip 3/3Not Capitalized The word 'ohm' is not capitalized unless starting a sentence or used in a title. You'll need a 220-ohm resistor for your project.