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2. Blondel's theorem - Wikipedia

   en.wikipedia.org/wiki/Blondel's_theorem

   There is also a three wire 240/480 volt version that is not Blondel compliant. Also in use are three phase meters that are not Blondel compliant, such as forms 14S and 15S, but they can be easily replaced by modern meters and can be considered obsolete. A form 2S watt-hour meter used for single phase 120-240 volt, 3 wire systems.

3. Electricity meter - Wikipedia

   en.wikipedia.org/wiki/Electricity_meter

   An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device over a time interval. Electric utilities use electric meters installed at customers' premises for billing and monitoring purposes.

4. Kill A Watt - Wikipedia

   en.wikipedia.org/wiki/Kill_A_Watt

   The power setting displays instantaneous power, and the kilowatt-hour setting displays energy consumed since last reset. When electricity is disconnected, the P4400's measurements and meters are reset. [6] To reset Kill A Watt models that store values, press Volt and Amp together, or press the Reset key in some models.

5. Current transformer - Wikipedia

   en.wikipedia.org/wiki/Current_transformer

   Many digital clamp meters utilize a current transformer for measuring alternating current (AC). Current transformers are used extensively for measuring current and monitoring the operation of the power grid. Along with voltage leads, revenue-grade CTs drive the electrical utility's watt-hour meter on many larger commercial and industrial supplies.

6. Electrical measurements - Wikipedia

   en.wikipedia.org/wiki/Electrical_measurements

   Ammeter and Voltmeter on a power supply. Electrical measurements are the methods, devices and calculations used to measure electrical quantities. Measurement of electrical quantities may be done to measure electrical parameters of a system.

7. Hobbs meter - Wikipedia

   en.wikipedia.org/wiki/Hobbs_meter

   A Hobbs Meter made by General Electric about 1970. Hobbs meter is a generic trademark for devices used in aviation to measure the time that an aircraft is in use. The meters typically display hours and tenths of an hour, but there are several ways in which the meter may be activated: It can measure the time that the electrical system is on.