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2. Voltmeter - Wikipedia

   en.wikipedia.org/wiki/Voltmeter

   The first digital voltmeter was invented and produced by Andrew Kay of Non-Linear Systems (and later founder of Kaypro) in 1954. [1] Simple AC voltmeters use a rectifier connected to a DC measurement circuit, which responds to the average value of the waveform.

3. Voltage - Wikipedia

   en.wikipedia.org/wiki/Voltage

   The above is the same formula used in electrostatics. This integral, with the path of integration being along the test leads, is what a voltmeter will actually measure. [20] [note 3] If uncontained magnetic fields throughout the circuit are not negligible, then their effects can be modelled by adding mutual inductance elements. In the case of a ...

4. Circuit diagram - Wikipedia

   en.wikipedia.org/wiki/Circuit_diagram

   A circuit diagram (or: wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations.

5. Voltameter - Wikipedia

   en.wikipedia.org/wiki/Voltameter

   Coulometers can be used to determine electric quantities in the direct current circuit, namely the total charge or a constant current. These devices invented by Michael Faraday were used frequently in the 19th century and in the first half of the 20th century. In the past, the coulometers of that type were named voltameters.

6. Electronic test equipment - Wikipedia

   en.wikipedia.org/wiki/Electronic_test_equipment

   Keysight commercial digital voltmeter checking a prototype. The following items are used for basic measurement of voltages, currents, and components in the circuit under test. Voltmeter (Measures voltage) Ohmmeter (Measures resistance) Ammeter, e.g. Galvanometer or Milliammeter (Measures current)

7. Voltage divider - Wikipedia

   en.wikipedia.org/wiki/Voltage_divider

   For example, some logic circuits operate at 5 V whereas others operate at 3.3 V. Directly interfacing a 5 V logic output to a 3.3 V input may cause permanent damage to the 3.3 V circuit. In this case, a voltage divider with an output ratio of 3.3/5 might be used to reduce the 5 V signal to 3.3 V, to allow the circuits to interoperate without ...