Primary and Secondary Coils, Small Student


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Now: $12.95
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Product Overview

The secondary coil slides over the primary coil, and the soft iron core slides into either or both. This rugged device is sensitive enough to be used with voltmeters instead of galvanometers. The coils are wound around hollow plastic cores, with a turns ratio of approximately 2 (@370) to 1 (@200). Provides a look at electromagnetic induction, ferromagnetism and transformer theory.

Input Voltage: 6-8V DC

Overall Height: 3.5" / 85mm
Weight: 5.2oz.
Iron Core length: 2.3" / 6cm
Iron Core Dimeter: 3/8" / 10mm

Primary Coil Spindle O.D.: 5/8" / 16mm
Primary Coil Spindle I.D.: 7/16" / 11mm
Primary Coil Turns (approx.): 200
Primary Coil Wire Diameter: 23AWG

Secondary Coil Spindle O.D.: 1-1/4" / 30mm
Secondary Coil Spindle I.D.: 15/16" / 24mm
Secondary Coil Turns (approx.): 370
Secondary Coil Wire Diameter: 28AWG


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  • 5
    Excellent demo

    Posted by Gregory Froelich on Dec 15th 2018

    I was using a 12V/10A power supply and got the coil cooking pretty quickly. Probably best to use a battery.

  • 5
    Nice Coil

    Posted by JR Ward on Aug 25th 2017

    This student size coil is well designed and nicely made.