Moving Coil Meters
Begins with a current-sensitive element. Though most modern meters have solid state digital readouts, the physics is more readily demonstrated with a moving coil current detector called a galvanometer.
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/movcoil.html
Voltage and Current Meters
Voltage is always measured between two points.Current is measured by passing all the current through the
meter.
http://www.itee.uq.edu.au/~engg1030/lectures/1perpage/lect3.pdf
Multimeter Tutorial
Complete on How to use in actual of a Electrical and Electronics Multimeter
http://www.ladyada.net/library/metertut/continuity.html
Electrical Measurements
Charge and Capacitance meter, ammeter, potentiometer, Quadrant electrometer, Electrodynamometer, wattmeter and others.
http://physics.kenyon.edu/EarlyApparatus/Titlepage/Electrical_Measurements.html
Electric Meters & Motors
By Andre Ampere and Werner Siemens. Says that when electric currents pass through the movable coil, a magnetic field is produced. This
field interacts with the permanent magnets to cause torque.
http://boomeria.org/physicslectures/secondsemester/electricity/metersmotors/metersmotors.html
AC Current Measurement
Quick, accurate, and safe current measurements can be made on medium and high-voltage systems at
the secondary of instrument current transformers (CT’s) using the TPI A254 Low-Current Clamp-On
Adapter.
http://www.kilowattclassroom.com/Archive/AN0008.pdf
AC voltmeters and ammeters
Permanent-magnet meter movements, like permanent-magnet motors, are devices whose motion depends on the polarity of the applied voltage.
http://www.faqs.org/docs/electric/AC/AC_12.html
Thanks for posting the detail info about the current transformers?
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