Induction Coil Apparatus
Product Code : SCL-PLE-11753
Quick Answer: The Induction Coil Apparatus (Ruhmkorff coil) steps a 6–12 V DC supply up to a high voltage that jumps a spark gap, showing mutual induction. It is offered in 10, 25, 50 and 100 mm spark-length versions and can power vacuum discharge tubes.
Last updated: 18 October 2026
Key Features
- Primary of heavy-gauge enamelled copper wire on a laminated iron core.
- Secondary of thousands of turns of fine, multi-layer insulated copper wire.
- Adjustable interrupter with a built-in capacitor to reduce arcing at the contacts.
- Insulated handles for spark-gap adjustment and a polarity reversing switch.
- Used to power Geissler and other vacuum discharge tubes.
Technical Specifications
| Specification | Value |
|---|---|
| Spark length versions | 10, 25, 50 and 100 mm |
| Primary coil | Heavy-gauge enamelled copper on laminated iron core |
| Secondary coil | Thousands of turns of fine enamelled copper, multi-layer insulated |
| Interrupter | Adjustable contact points |
| Capacitor | Built-in, high voltage |
| Input | 6–12 V DC |
| Controls | Insulated spark-gap handles, polarity reversing switch |
How It Is Used
A 6–12 V DC supply is connected to the primary. The interrupter makes and breaks the primary current rapidly, and each collapse of the magnetic field induces a high voltage in the secondary that appears as a spark across the gap. The gap is set with the insulated handles, and the output can drive a discharge tube, making it an induction coil for the lab that also illustrates the transformer principle.
Frequently Asked Questions
What supply does the Induction Coil Apparatus need?
6–12 V DC, from a battery eliminator or a lead-acid battery.
Which spark lengths is the Induction Coil Apparatus made in?
Versions giving 10, 25, 50 and 100 mm spark lengths are listed.
Related Physics Lab Equipment
See the full physics lab equipment range, or these related electromagnetic induction apparatus:
- Mutual Induction Model
- Faraday's Law Apparatus
- Battery Eliminator
- Demountable Transformer Kit
- Spectrum Tube Power Supply
JLab India accepts export orders for the Induction Coil Apparatus from Estonia, Somalia, Serbia, Mongolia, Grenada and Dominican Republic.
For a quotation on the Induction Coil Apparatus, contact JLab India on +91-8569909696.
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