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CAT NO: DIDACTICELECTROMETER0127
Induction Coil.
An induction coil is a coil of discharging type.
This type of transformer is used to output high-voltage pulses starting from a low-voltage direct-current power supply.
The direct current crossing the primary winding is cut off repeatedly by a vibrating contact called switch, to provoke the necessary variation of fl ux that induces the desired voltage in the secondary winding. The term ‘induction coil’ is also used to indicate a coil crossed by a high-frequency alternating current that heats the objects placed inside it as it occurs in induction furnaces.
TRAINING PROGRAM
• electromagnetic induction
• operation of discharging coil
• how high-voltage pulses can be produced from a lowvoltage d.c.
power supply
DESCRIPTION
This coil consists of two solenoids of insulated copper wire wound around a unique iron core. One of these solenoids, called primary winding, consists of tens or hundreds of wire turns, whereas the other solenoid, called secondary winding, consists of several thousands of turns of thin wire.
When crossing the primary winding, electric current creates a magnetic field and the secondary winding is coupled magnetically through the iron core.
The primary winding acts as field magnet and stores energy in the corresponding magnetic field.
When electric current is cut off suddenly, the magnetic field is reduced rapidly and this provokes a high-voltage pulse through the secondary winding for electromagnetic induction.
Thanks to the high number of turns of the secondary winding this output pulse has a voltage of many thousands of volts.
This voltage is sufficient to produce a spark or electric discharge across the air separating the terminals of the secondary winding.
The size of an induction coil is often indicated according to the length of the spark that it can produce.
TECHNICAL CHARACTERISTICS
Induction coil being able to produce a spark with an input of 6-12 Vdc ; consequently it can perfectly be used in vacuum tubes, eudiometers, etc… Low-voltage input is realized by a pair of jacks of 4 mm.
Models supplied according to the length of the spark being produced: 10, 15, 20, 25, 30, 50, 75, 100 mm
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