Mohm can mean milliohms or megaohms, measuring electrical resistance. Milliohms are used for low resistance objects, while megaohms are used for high resistance objects like insulation and distilled water quality. Moving ohms measure the mobility of sound waves and are measured in Siemens or mhos.
The term mohm has multiple meanings, depending on what the ‘m’ means. In some cases, the m is a prefix used before -ohm and stands for ‘milli-‘ or ‘mega-‘. Mohm can also be short for mobile ohm, a unit used to measure the mobility of sound waves.
When mohm refers to milliohms or megaohms, ohm is a mechanical ohm, measuring electrical resistance. In this context, resistance refers to how much a material resists the flow of electric current. One ohm is equal to the amount of resistance sustained when 1 volt of electromotive force produces 1 ampere of electric current. A milliohm, written as mohm or mΩ, is one thousandth of an ohm, while a megaohm, written as Mohm or MΩ, is one million ohms.
Milliohms are the units of measurement used for objects that have very low resistance. Milliohmmeters can be used to test batteries, especially batteries in small electronic devices, designed to have low resistances. Batteries with lower resistance hold a charge longer, as there is less force resisting the flow of current. The resistance of capacitors, devices that store electrical charge, is also often measured in milliohms, as capacitors with lower resistivity are more efficient.
Megaohms are used as a unit of measurement for objects with very high resistance. They are often used to test insulation, which should have a high resistance in order to minimize temperature changes in whatever is being insulated. The quality of distilled water is also measured using megohms. The quality of distilled water ranges from 1 to 18 megohms, with higher resistances indicating higher quality. The quality of distilled water is important in the manufacturing process of semiconductors and other electrical parts.
Moving ohms measure the mechanical mobility of sound waves. A moving ohm is the reciprocal of a mechanical ohm. In other words, one divided by the number of mechanical ohms gives the number of moving ohms. While a mechanical ohm measures resistance, a moving ohm measures the inverse of resistance, called conductance, so a higher measurement in moving ohms means sound waves can move more easily.
Siemens is the most commonly used term for measuring conductance indicated by moving ohms. The unit was originally called mho – ohm spelled backwards – because it was the inverse of ohm, and mho is still sometimes used. Mobile ohm or mohm is probably the least commonly used term for this measurement.
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