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The Ontology of units of Measure (OM) is dedicated to measurements, their dimensions and conversions between different units and scales. As such, it contains all the information necessary for those who want to model quantities in detail. OM is often used to provide instances of units of measure for the `saref:UnitOfMeasure` class. We also reused OM for this purpose. However, we noticed that OM lacked some energy-specific types of units that were required by the InterConnect pilots. Therefore, we created the unit of measure (ic-uom) module that extends OM with the following quantities (and associated units of measure), which are shown in Figure 9:
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The Ontology of units of Measure (OM) is dedicated to measurements, their dimensions and conversions between different units and scales. As such, it contains all the information necessary for those who want to model quantities in detail. OM is often used to provide instances of units of measure for the `saref:UnitOfMeasure` class. We also reused OM for this purpose. However, we noticed that OM lacked some energy-specific types of units that were required by the InterConnect pilots. Therefore, we created the unit of measure (ic-uom) module that extends OM with the following quantities (and associated units of measure), which are shown in the subsequent diagram.
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**Additional quantities**
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Additional quantities
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- `ic-uom:ActivePower`: Active or real power, to be measured in watt (W).
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- `ic-uom:ApparentPower`: Apparent power, the magnitude of complex power, to be measured in volt-ampere (VA), equivalent to watt.
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- `ic-uom:ReactivePower`: Reactive power, to be measured in volt-ampere reactive (var), equivalent in dimension to watt.
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