SLIDING CONTACT RESISTORS

Ceramic formers with constantan windings, oxidized to give perfect insulation.

Enclosed in metal case, finisched in oven baked enamel.

Graduated cursor scale with 100mdivisions

Each rheostatm has 3 terminals for connection as fixed resistance, variable resistance, or potentiometer

The 300 Ω and 1400 Ω rheostats may be used as potentiometers for mains tension

4694.11Sliding contact  resistors, 2.9 Ω

Maximum current 9 A continuos

4694.21 Sliding contact resistor, 10 Ω

Maximum current 2.2 A continuos.

4694.31 Sliding contact resistor, 50 Ω

Maximum current 2.2 A continuos.

4694.41 Sliding contact resistor, 120 Ω

Maximum current 1.4 A

4694.51 Sliding contact resistor, 300 Ω

Maximum current 0.9A continuos.

469461 Sliding contact resistor, 1400 Ω

Maximum current 0.4 continuos.

4696.00

COMPARISON BOARD

For the verificazion of Ohm's Law.Composed of a wooden board faced on both sides with laminated plastic , with 4 wires, lengh 1 m, of different sections and of different metals; with binding-post terminals

4710.10

CONDUCTIVITY APPARATUS

Consist of a transparent plastic stand with metal base supporting three cells in form  of 50 ml beakers. Electrodes are suspended into the cells, each having a low voltage lamp in series ti indicate the current flowing. The three cells and lamps, as a group are connected in parallel and provided with a pair of 4 mm sockets for connection to the external supply. The lamps provided will alow operation on a supply of up to 12 V AC or DC. Overall dimensions 200 x 180 x 90 mm, widh x depth x height.

4716.10

HOFMANN VOLTAMETER

FOR EXPERIMENTS WITH THE ELECTROLYSIS OF A SOLUTION

Comprises a glass unit, metal stand, and one pair of platinum electrodes

A scale from 0 cm/3 x 0.5 cm/3 etched on the limbs allows direct reading of the amoubts of gas generated at the electrodes.

Pair of platinum electrodes supplied, fused into glass tube with internal lead and Ø 4 mm plug socket, with rubber stopper for insertion into voltameter limbs.

Accessories and spare parts for 4716.10:

4716.11 Graduated gless tube, spare

4716.12 Platinum electrode

with hole and rubber stopper.

4716.12 Carbon electrode

with rubber stopper and crodile clip

4720.00

INDUCTION CURRENT APPARATUS

To be used togheter with a tester (cat. 2274.10) for the qualitative study of induction currents. Essentially comprises two solenoids, with one smaller so as to fit into the larger. The first solenoid is wound with 110 turns of copper wire of 1 mm (R = 0.5 Ω)

Complete with soft iron core.

4730.00

DEMOUNTABLE TRANSFORMER

In addition to trasforming the voltage of an A.C. current, this transformer may also be used for the performance of a large number of experiments in electromagnetism.

Made up of a laminated ferrosilicon core accepting two coils from among those supplied with the kit.

Componed elements:

4730.01 Coil, 6 turns 85 A max

4730.02 Coil, 40 turns, 20 A max

4730.03 Coil, 300 turns, 4 A max

4730.04 Coil 600 turns, 2 A max

4730.06 Coil 1200 turns, 50 mA max

4730.10 U-core, laminated iron, with yoke locking system

4730.11 Yoke to close U-core

4730.12 Coil locking clamp, pair

Accessories for 4730.00:

4730.13 Double-wind coil

Primary 600 turns, secondary 36 turns, with central connector plug.

4730.30 ANULAR MELTING TROUGH

On insulating handle. Demonstrates induction heating

4730.31 METAL ALLOY FOR MELTING

4730.32WELDING COIL

Model of the spot welder

4730.40

ACCESSORIES KIT 1

FOR DEMOUNTABLE TRANSFORMER

COMPRISES:

• iron core

• flashlight bulb, 3.5 V

• plastic lamsocket on base (cat. 2505.00)

• galvanometer with moving component

• iron filings in container

• iron pieces in cointeiner

• magnetic needle

•  stand for magnetic needle

• 2 bar magnets

•  pair of cylindrical toroidal magnetes

• Knitting needle

• 2 soft iron rods

•  aluminuim ring

•  2 crocodile clips

• pin with hook

Some of the experiments possible with this kit:

- the demonstration of the magnetic field of an electromagnet

- current induced by the movement of a permanent magnet near a coil

- induction currents and Lenz's law

- extra currents

- current induced in a coil by the variation of the magnetic circuit

- Thomson's right.

4733.01

INDUCTION COIL (RUHMKORFF COIL)

This a modern version of the classic device for producing higt voltages by transforming the output of a low voltage by transforming the output of a low voltage direct current generator. The prumary circuit is continually interruped by a trembler swich with a condenser in parallele to reduce spark( following the suggestion of Fizeau).

Produces 60-70 mm spark between secondary terminals with primary input of 10-12 V D.C.. A 6 V tension produces secondary voltage sufficient to operate discharge tubes. The coils are mounted on a PVC base. The circuit diagram for the device is printed on the coil sheath.

Dimensions: 1401 x 250 x 200 mm (h)

Accessories and spare parts for 4733.01:
4733.05 Trembler swich, spare low tension power supply unit (see cat. 24.08.00)

4743.01

MODEL OF ELECTRIC MODEL

COMPLEX FOR THE STUDY OF ELECTRIC CIRCUIT LAWS

The complex comprises a set of insulated panels, each with a different electric circuit with interchangeable components.

These panels are mounted on a board supplied with a variable D.C. power supply and with voltmeter and milliammeter which can be connected at various points of the circuit by two rotating switches. The points where the voltmeter is inserted are indicated on the panel by a green light,while those where the milliammeter is inserted by a red light.

Each component is housed is a small insulated container which plugs in directly at the preset points on the panel.

4760.00

BOARD FOR ELECTRIC CIRCUITS

For the insertion of the circuit panels.

Instrument panel houses the D.C. power supply and regulator knob, a voltmer and ammeter, both with large scales ( 100 x 125 mm), and controls for the selection of meter ranges and the insertion of the instruments in the different points of the circuit.

TECNICAL CHARACTERISTICS

Milliammeter:

Moving coil instrument with center zero, two ranges (1 and mA), may be inserted in three diffeerent points of the circuit. With diode rectifier for A.C. measurements. Internal resistance is approximately 4 Ω for 1 mA range and 0.4 Ω for the 10 mA range in D.C.

Voltmeter: 

Moving coio, center scale, with two ranges (1 and 10 V), may be inserted in 4 different points of the circuit. Complete with diode rectifier  for A.C. measurement. The sensitivity of the voltmeter is 10.000 Ω/V in D.C.

Generator

Supplies a current which may be varied from 0 to 10 V D.C. with pole reverser swich.

IMPUT POWER:

110-220 V 50-60 Hz

PROTECTION:

by 250 mA fuse (cat. 2512.02)

In steel sheet (oven-baked painted ) and black P.V.C. Dimensions (excluding base):

530 x 400 mm. Mais cable complete with 19 mm plug and earth.

PANELS FOR THE VERIFICATION OF CIRCUIT LAWS

These panels are constructed for use  with cat. 4760.00 board on which they are wasily mounted. In sqare PVC sheet with electric circuit on rear and circuit diagraqm reproduced on front face.

The varius components of the circuit (each housed in a separate container) may be plugged in directly at the proper points of the circuit by means of two jacks (see cat. 4760.30I4760.80).

The panels are automatically connected to the board circuit when mounted.

Each panel is provided with several points for the insertion of the voltmeter (V1, V2...) and millimmeter (A1, A2....) which can be selected by two rotating switches on the instrument panel. A green ligt and a red light indicate the points of insertion of the voltmeter and milliammeter, respectively.

The panels with D.C. circuits and those with the electronic circuits are connected to the D.C. power supply housed in the main board when mounted; the A.C. circuit panels require an external power supply (eg. the low -frequency signal generator , cat .2290.03) Nine different panels are individually available.

4760.04

PANEL FOR KIRCHHOFF'S FIRST LAW

For the verification of Ohm's law in D.C. and for the measurement of the internal resistance of the ammeter and voltmeter of the main board.

4760.06

PANEL FOR KIRCHHOFF'S SECOND LAW

This panel allows for the measurement of the equivalent resistance of two or three resistors in series and for the verification of Kirchhoff's second law.

4760.08

WHEATSTONE BRIDGE PANEL

This is the classic Wheatstone bridge with two known and one unknown resistors to be inserted on the panel; the fourth resistor R is already inserted and may be varied between 0 and 1 k.

The milliameter is inserted at position a1, for the control of the balance.

In addition to the measurement of an unknown resistance, it is possible to verify the conditions for the balance of the bridge and to observe its sensitivity to the variation of the imput tension and of the values ofthe comparison resistors.

Accessories for 4760.02I 4760.08:

Set of 12 resistors (cat. 4760.30)

4760.10

SERIES-PARALLEL CIRCUITS PANEL

The circuit may be completed by the insertion of the usual components, as well as of one or two dry cells in housing, and of external batteries connected by means of the leads included in the set.

The tension and the current may be measured in four and three different points of the circuit, respectively.

The panel comes complete with two dry cell housing and 4 connecting leads with banana plugs and crodile clips for connection to external power supplies.

This panel allows for te building of circuits with resistors in series or in parallelel.

It may be used for the verification of Kirchhoff's second law for more than one loop in a circuit, of Thevenin's theorem, and of superimposition theorem.

Accessories for 4760.10:

Set of 12 resistors (cat. 4760.30)

4760.12

A.C. SERIES CIRCUITS PANEL

For the study of the passive components in an A.C. circuit. Two or three components may be inserted in series for the verification of the formulas giving total impedance, and for the study of circuit response to variations in imput frequency.

The voltmeter has three possible points of insertion, while the ammeter may be inserted at only one point.

Ammeter and output tension readings may taken by an external oscilloscope for the study of the phase relation between tension and current, via two pairs of plug sockets on the panel.

The panel is complete with one pair of connecting leads.

Accessories for 4760.12:

Set of 12 resistors (cat. 4760.30)

Set of 10 inductors (cat.4760.50)

Set of 10 condensers (cat. 4760.70)

Low-frequency generator (cat.2290.03)

Oscilloscoper (cat.2280.65)

4760.14

A.C PARALLEL CIRCUITS PANEL

In addition to the behaviour of the individual components, the panel is designed for the study of the behaviour of an A.C. circuit with two or three passive components in parallel, and to observe the responsed to variations in the frequency of a parallel resonant circuit.

The ammeter may be inserted at three different points, one for each of the parallel loops, while the voltmeter may be inserted at the generator.

Accessories for 4760.14:

Set of 12 resistors (cat. 4760.30)

Set of 10 inductors (cat. 4760.50)

Set of 10 condensers (cat.2290.03)

Oscilloscope (cat. 2280.65)

4760.16

PANEL FOR CHARACTERISTICS OF AN ACTIVE DIPOLE

Two points provided on the panel for the insertion of diodes, resistors, and other components. The voltmeter may be inserted at three points, at two components, and at the generator (V₁).

The milliammeter may be inserted at one point only.

The panel allows for the study of the characteristics of on-linear conductor such as germanium and silicon diodes or Zener diodes (included in the components group cat. 4760.80)

Complete with silicon diode, 6 kΩ resistor, and short-circuit bridge, all housed in special cases.

 Accessories for 4760.16:

 set of 12 resistor cat. 4760.30

set of 10 inductors cat. 4760.50

set of 10 condensers cat. 4760.70

4760.18

PANEL FOR CHARACTERISTICS OF AN ACTIVE QUADRUPOLE

Both PNP and NPN transistors can be mounted on the panel. Tension and current can be mesured at various points of the circuit. In addition to transistors, components of the sets cat. 4760.30, 4760.50, 4760.70 can be inserted.

Power imput is from the main board, with rator direction according to the choice of generator mounted on the panel. The type of transistor mounted on the panel. The panel is suitable for the study of the verification of the relation between base current, and currents of the collector and emitter of silicon transistors, and study of the behaviour of the transistor as an amplifier in the CE, CB, and CC configurations.

Accessories for 4760.18:

set of 12 resistor cat. 4760.30

set of 10 inductors cat. 4760.50

set of 10 condensers cat. 4760.70

ACTIVE AND PASSIVE CIRCUIT COMPONENTS

Housed in plastic case with 2 mm pins for mounting on panels. 

4760.30

SET OF 12 RESISTORS

Accuracy 1%, power rating 0.5W

Incluted

2 resistors 1 kΩ

2 resistors 2 kΩ

2 resistors 3 kΩ

1 resistors 4 kΩ

1 resistors 6 kΩ

1 resistors 8 kΩ

1 resistors 10 kΩ

1 resistors 100 kΩ

4760.50

SET OF 10 INDUCTORS

Includes:

3 inductors, 3mH

3 inductors, 10 mH

3 inductors,  30mH

1 variable inductors, 28-78 mH

4760.70

SET OF 10 CONDENSERS

Includes:

3 condensers,       1 nF

3 condensers      10 nF

3 condensers    100 nF

1 condenser,   1000 nF

4760.80

SET OF 8 ACTIVE COMPONENTS

Includes

1 PNP transistor

1 NPN transistor

1 silicon diode

1 germanium diode

1 Zener diode, 33 V 450 mW

1 Zener diode, 5,1V 450 mW

1 unijunction transistor (UJT)

1 silicon controlled rectifier (SCR)

4761.00

WOODEN PANEL STAND

Holds up to 8 panels.