Units Of Measurements Used By An Electric Meter

The most popular unit of measurement used by electricity meter is kilowatt hour. One kilowatt hour is equal to the quantity of power used by one kilowatt of load during a time period of one hour or 3,600,000 joules. Some of the power supplying companies use SI (International System) mega joule as units of measurements in electric meter.

The units of measurements in electric meter which are used to measure the demand of electric power are watts, however, averaged over a period, most of the times a quarter or half hour.

The Volt-amperes are the measurement units electric meter use to measures the amount of the entire power moved through a distribution network, including reactive and actual. This is equal to the product of root-mean-square volts and amperes. Volt-amperes reactive, (varh) in kilovar-hours are the units of measurements used by electric meter to measure the reactive power. An inductive load or a lagging such as a motor has negative reactive power. While, on the other hand the capacitive load or a leading load has positive reactive power. There are many ways to measure the distortion of the electric current by loads. The power factor is the ratio of resistive to volt-amperes. A capacitive load has a leading power factor, and an inductive load has a lagging power factor. A purely resistive load such as a filament lamp, heater or kettle exhibits a power factor of one.

Other Units of Measurement

There are other units also which are different from the units of measurements used by electric meter. In other words, in addition to the commonly used units of measurements in electric meter, there are many other units which can be used. The meters which measured the amount of charge in coulombs are called as ampere-hour meters, were used in the early days of electrification. These were dependent upon the supply voltage remaining constant for accurate measurement of energy usage, which was not a likely circumstance with most supplies. Some of the electric meters measured only the duration of time for which current flowed, and no measurement of the current and magnitude of voltage being made. These units of measurement in electric meter were only suited for constant load applications. However, neither of these types is likely to be used today.

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