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عرض 631–645 من أصل 1963 نتيجة
Decade Inductance Box – 7 Dial
Housed in a box with seven dials and fitted with 4 mm output plugs, the unit allows a range of inductances from 1 ?H to 10 H.
7 Decade Inductance Box
(i) 1 ?H to 10 ?H in steps of 1 ?H
(ii) 10 ?H to 100 ?H in steps of 10 ?H
(iii) 100 ?H to 1 mH in steps of 100 ?H
(iv) 1 mH to 10 mH in steps of 1 mH
(v) 10 mH to 100 mH in steps of 10 mH
(vi) 100 mH to 1 H in steps of 100 mH
(vii) 1 H to 10 H in steps of 1 HSKU: PH50586GDeflection Tube
To show deflection of cathode rays by a magnet. Horizontal tube is fitted with a fluorescent aluminium plate, the cathode side of which is bent at right angle and is provided with a slit. Cathode rays passing through the slit cast a sharp and bright shadow across the aluminium plate. When a magnet is brought near, the cathode rays deflect sharply.
SKU: PH95035Demonstration Diffraction 3 in One
For demonstrating the principle of the diffraction grating and the way in which its properties are dependent upon the number of lines per unit length. Comprises a card mount 90 x 40 mm approximately with three 16 x 9 mm apertures, each containing a diffraction grating replica. The gratings are of 100 lines / mm. 300 lines / mm and 600 lines / mm, respectively and are protected by cover glasses.
SKU: PH30677Demonstration Meter
With the help of interchangeable scales (PH64201), this versatile instrument or demonstration meter that can be converted to an AC or DC, voltmeter or ammeter with selection of various ranges for each mode. With a high quality moving coil, spring controlled movement with full scale deflection of 5 mA or 100 mV DC. The long pointer has a spade end and is clearly visible from a distance. Fitted in case with glass front and back. The instrument can be used with different dials to give different voltage and current ranges. All dials are interchangeable and each has a plug coupler to fit the instrument. The coupler connects appropriate resistors, shunts or rectifiers to convert the instrument to the range as given on the scale of the particular dial. The scales have clear bold figures and are marked on both sides to enable the lecturer also to observe the reading from the back of the instrument. A zero adjuster allows the instrument to be used for centre zero dials. One dial of range 50-0-50 mV DC is supplied with the instrument. In plastic case.
SKU: PH64200Demonstration Relay
This Relay Demonstration Unit allows the investigation and study of how a relay functions in a clear and practical manner. A useful property of this Demonstration Relay Unit is that the circuit powering the coil is easily seen to be completely separate from the circuit switched on by the relay. This is one of the reasons relays are used where a safe low voltage circuit can be used to control a high-voltage circuit. When a current flows through the coil an electro-magnetic field is produced. This field attracts the iron armature whose end makes the contact, completing the circuit and illuminating the Lamp. When the current is switch off, the contact will open again, switching the
circuit off.SKU: PH41165Demountable Transformer
This heavy duty demountable transformer can be used for the study of transformertheory and many other alternating current phenomena. This kit consists of:
1. A magnetic circuit made of highly permeable U shape metal sheet, which can be closed using two clamps with tightening screws.
2. Section: 40 x 40 mm with 150 mm length and 170 mm height.
3. One coil of 6000 turns with maximum current of 0.2 A. Intermediary coil of 2000 turns output.
4. One coil of 600 turns with maximum current of 2.5 A, which is mainly used to create the primary of transformer.
5. One coil of 1200 turns, with maximum current of 1.25 A, fitted with intermediary 400 and 800 turns outputs.
6. One coil of 72 turns, with maximum current of 12 A, fitted with intermediary 6, 30, 54 and 66 turns outputs.
7. Power supply cable.SKU: PH50170
