Electricity

A simple voltaic cell with one copper and one zinc plate electrode (size 90 x 25 x 1.5 mm). Each electrode is fitted with terminal. Also includes a battery jar of size.

Mounted on a panel, large size parts, wiring of electric bell is clearly visible. Operates on 4 – 9 V.

This apparatus is an effective demonstration of how the earth wire and fuse act together to protect both the user and the appliance.
When the appliance is connected correctly and the LEDs in the appliance will illuminate to show the appliance is working. A fault is then demonstrated by swapping the live wire from inside the appliance to the case to show either the fuse melts (protecting the user and appliance) or in the case of no earth wire, the LEDs illuminate to indicate the passage of current through the person to ground. The fuse is easily visible and can be seen to ‘blow’ when a fault occurs. The unit is supplied with 10 meters of fuse wire and full instructions. A 12V D.C. power supply is required. Connections are made via 4mm shrouded sockets.

Enables students to investigate nature and properties of electricity by using simple circuits which are easily constructed on a baseboard. The connector system uses P.C.B. strips with cut-out sections whose ends can easily be inserted in spring terminals, ensuring low contact resistance and ease of connection. The kit consists of :

• 1 Baseboard, plastic, with spring terminals and three battery holders.
• 3 Batteries.
• 10 Lamps 1.25 V M.E.S.
• 6 Lamp holders mounted on P.C.B. connectors.
• 10 Plain connector P.C.Bs.
• 1 Wire wound potentiometer with crocodile clip connections.
• 1 Silicon diode.
• 1 Resistor 3.9 ohm 2.5 W.
• 1 pair Leads, red, with crocodile clip at each end.
• 1 pair Leads, black, with crocodile clip at each end.
• 1 pair Leads, yellow, with crocodile clips at each end.
• 2 Switches mounted on P.C.B. connectors.
• 1 PVC rod 15 cm long.
• 2 Soft iron nails, 5 cm long.
• 2m Bare copper wire, swg 20.
• 2m Bare eureka wire, swg 34.
• 2m Plastic covered copper wire.
• 1 Electrode support.
• 10 Pencil lead electrodes.
• 1 Sheet copper foil, 150 mm square.
• 1 Pack Steel wool.
• 1 Instruction manual in English.

This heavy duty demountable transformer can be used for the study of transformer theory and many other alternating current phenomena. This kit consists of:

• A magnetic circuit made of highly permeable U shape metal sheet, which can be closed using two clamps with tightening screws.
• Section: 40 x 40 mm with 150 mm length and 170 mm height.
• One coil of 6000 turns with maximum current of 0.2 ampere. Intermediary coil of 2000 turns output.
• One coil of 600 turns with maximum current of 2.5 ampere, which is mainly used to create the primary of transformer.
• One coil of 1200 turns, with maximum current of 1.25 ampere, fitted with intermediary 400 and 800 turns’ outputs.
• One coil of 72 turns, with maximum current of 12 ampere, fitted with intermediary 6, 30, 54 and 66 turns’ outputs.
• Power supply cable.

Apparatus is designed primarily for demonstration of the basic principles of transformers. It consists of a laminated U-core with laminated I-core, both with 30 x 25 mm cross-section to form a closed core of size 105 x 140 mm. Heavy aluminium alloy stand with removable clamping rods, 2 pole pieces, each 65 x 25 x25 mm with one end cone-shaped, to accept support rod and shading ring. Poles also have a hole drilled through lengthwise to take a light beam.

Comprising 1 welding coil of 5 turns on former with insulated handle and short-circuiting pins, 1 annular melting trough with insulated handle to show heating by induction, 1 jumping ring which is thrown clear when primary current is started and a floating ring which remains freely suspended when primary current is flowing.

Operates on 4 to 6 V battery, on wooden base with two 4 mm socket terminals, provided with self-induced magnetic field.

The electric motor model (same as PH50213) is mounted on a base and provided with a driving wheel. Output is through 4 mm sockets and a LED is also provided as a simple output indicator. Also includes one spare belt.

Generates both AC and DC. When the two brushes of the generator are put in the two ends (on the complete loop) of the commutator, the output is an AC. When the brushes are put in the middle (on the half loop) of the commutator, the output is a DC with one spare belt Includes Instructions.

Each centre tapped, wound on plastic former, to fit double ‘C’ core, with three 4 mm socket terminals.

The apparatus demonstrates the principle of Electromagnetic Induction and helps explain the concept of a transformer. Primary and Secondary coil consist of coils mounted on plastic spools, with 2 binding posts on each coil. You can slide the primary coil inside the secondary coil. Also includes a soft iron core for induction experiments. Primary coil has 480 turns while secondary coil has 3800 turns. Requires a galvanometer and bar magnets, not supplied with apparatus.

The Current Balance is used as an accessory to Air Core Solenoid (PH50255) to measure the force experienced by a conducting loop carrying an electric current when it is placed in a magnetic field.

Copper-constantan-copper, to form hot and cold junctions. Length of soldered junctions is about 38 mm. The coiled lead is about 50 mm long.

Comprising of 3 iron wires and 3 copper wires welded to make 5 junctions (3 on top and 2 on bottom side). Brass terminals are provided for connections.

Four gap systems, enabling two additional resistances to be interpolated in the additional gaps, enable greater accuracy of measurement by reducing unwanted resistance to a minimum. Two brass strips are provided to close the gaps when so required. Complete with jockey.

For Wheatstone bridge and potentiometer, with insulated handle, plated brass contact and a plated brass terminal.

Resistance Substitution Box is a convenient instrument for determining the desired resistance values in circuits under design or test. This resistance substitution box has 12 different values 100 Ω, 220 Ω, 470 Ω, 1 kΩ, 2 kΩ, 4kΩ, 10 kΩ, 22 kΩ, 47 kΩ, 100 kΩ, 220 kΩ and 470 kΩ . All resistors are precision 1% resistors and are of 1-watt rating. Selected resistor can be attached in any circuit with 4mm two red safety sockets.

The kit illustrates that the resistance of a wire depends on its length, diameter and material of that wire. Each of the eight coils is wound on plastic spools with brass terminals for easy connection. The coils are stored in a clear plastic box.

Consists of six rotary switches in decade sequence mounted on a plastic box with each value clearly marked. The total resistance value can vary from 0 to 1,111,110 x 1 Ω. Accuracy is within ±1 %. Two universal binding posts are provided for easy connections.

With two ratio dials of 10,100 and 1000 ohms each and a resistance arm of four dials, each of ten coils of 1, 10, 100 and 1000 ohms, giving total resistance of 11,110 ohms, with 4 mm socket terminals for battery, galvanometer and unknown resistance. Highly stable resistances are used. Accuracy ±0.1%.

This three-step inductor consists of a coil of enamelled copper wire wound over an insulated spool. The coil consists of 4 layers of 200 turns each. The tappings at 200, 400 and 800 turns are brought out at 4mm sockets. The output inductances at these tappings are as follows.

• No. of turns Inductor Resistance 200 0.3mH 0.6Ohm.
• 400 1.2mH 1.2 Ohm.
• 800 5mH 2.6Ohm.
• One can easily change the inductor value of the instrument on just inserting a soft iron core inside the bobbin.

Capacitance range of 0 to 1.1μF in steps of 0.01μF. Markings for the dials is printed on the sturdy case.

• Capacitance Range: 0 to 1.1μF x 0.01μF.
• Accuracy: +5%.
• Voltage Rating: 400 VDC.

A solar cell and solar motor mounted on metal base. Solar cell unit comprises a 30 x 70 mm selenium photo-voltaic cell Low-power motor is designed specifically to run from solar cells Demonstrates conversion of solar energy to electrical energy, then to mechanical energy.

Trans-Ratio is a simple transformer system that allows students to investigate the relationship between primary voltage, secondary voltage and the turns ratio. The Primary coil has tappings at 200, 400 and 600 turns while the Secondary has 100, 200, 300, 400, 500 and 600 turns all brought out to 4mm sockets. An AC supply of upto 6 V as well as AC voltmeters are required for demonstration purpose.

To demonstrate Ohms Law. Consisting of a wooden enclosure with milliammeter, voltmeter, rheostat, push key and terminal posts. Requires an external battery (not supplied) and a suitable resistance (not supplied). Resistance can be calculated using Ohm’s Law by noting current and voltage. A rheostat is provided to control current flow. Circuit diagram is provided on the panel. With instructions.