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Magnetism & Electricity Page I
 
Variation Of Resistance (With Temperature)
The resistance of all pure metals increases with rise in temperature and decreases with lowering the temperature. This model helps you to verify the same. The model comes with a small coil of GI wire with connecting pin soldered. The model operates with 1.5V DC supply. After making complete circuit connections, if you heat the coil using candle flame, you will notice change in intensity of the bulb connected in the circuit. This change in intensity of the bulb indicates the change in resistance of the coil given.
 
 
Heating Effect Of Current

When current is allowed to flow through a conductor, it gets heated up. This model allows you to experience the same. The model comes with stainless steel wire fixed between two acrylic pole with electrical circuit provision to pass current through it.

Two connecting pins with crocodile clips and small quantity of wax are provided with model. Fix two small pieces of wax at opposite ends of the wire and complete the circuit connection by connecting clips to the ends of the wire, and insert the cells in cell holder. You will notice that the wax melts down immediately indicating the heating up of the wire.

 
 
Power Loss In Transmission
A tremendous amount of electricity that power plants generate is wasted by resistance in the transmission wire that carry the electricity, from the plant to our houses. This model gives you the live action of the same. Two connecting pins with crocodile clips are provided with model. Cells not included. After making complete electrical connection, the bulb which is connected directly to the supply glows with the more intensity where as another bulb which is connected through wire glows with less intensity indicating electricity being wasted due to transmission lines.
 
 
Domestic Circuits (Series & Parallel)
We prefer parallel circuit connections in our homes rather than series circuits connections. This model consisting of one series circuit and another parallel circuit will help you to understand the advantage of parallel circuit over series circuit in domestic connections. Here both circuit consists of 3 small bulb holders with bulb, wires with connecting pins are provided with each circuit. The models operates with 6v DC supply.
Cell box and dry cells not included.
 
 
Testing A Fuse  
 
 
 
Mechanical Effect Of Current
Current carrying conductor placed in a magnetic field experiences a mechanical force. This model allows you to experience the actual motion of the conductor in the magnetic field. It also allows you to change the direction of the motion on the conductor by changing direction of current and also the direction of the magnetic field. The model comes with one 2" ring magnet and brass rod of 3" in length and 3mm in diameter. Operates with 9V DC supply which is not included.
 
 
Flemings Left Hand Rule
This attractive model demonstrates the basic principle behind the construction of a motor or mechanical effect of current. The apparatus consist of small brass bar (2mm) suspended by a wire in a magnetic field created by fixing two ring magnets on a clear plastic base. By passing current through the conductor one can observe, the mechanical force experienced by the conductor, which is in accordance with the Fleming's left hand rule.

Stretch the fore finger, thumb and middle finger of your left hand such that they are mutually perpendicular. Now you can relate this to the direction of field, current and mechanical force in the model.
 
 
DC Motor

This model helps you to understand how electrical energy being converted into mechanical energy. This simple and attractive model shows all the parts of dc motor such as armature, split rings, brushes and magnetic field. It works even with 1.5 volts DC supply. You will be amazed to see the change in speed of armature as you increase the voltage in steps. Supply not included.

 
 
Simple Motor
After experiencing the working of Flemings left hand rule principle, you will definitely love to construct a DC motor. Here is a model for that. This simple motor model gives you the live action of a DC Motor. The model includes perfectly winded copper coil and a ring magnet of 2" diameter

 
 
Simple Motor Kit  
This  kit consists of insulated copper wire of 1m length , one ring magnet of diameter  2 inch two brass strips, blade and elastic band. Construct your own circular coil using copper  wire, the using a dry cell you can construct a simple motor
 
 
Motor Without Magnet  
 
 
 
Electromagnetic Induction
A simple and effective device to demonstrate Faraday's magnet and coil experiment. Apparatus consist a coil of copper wire of 250 turns wound on a hollow plastic tube, which is fixed permanently on a plastic base with two connecting terminals. These terminals are used for connecting Galvanometer.

One can observe the change in nature of deflection in galvanometer when north pole of the magnetic moved and south of the magnetic is moved inside the coil.
 
Faradays Experiment (with Moving Coil)  
 
 
Mutual Induction
Another simple and effective device to demonstrate Faraday's coil & coil experiment. Can be used to study mutual Induction and transformer principle.

The apparatus consist of two coils. One primary coil made from copper wire of 26 guage and of 250 turns. Another one is secondary coil made from copper wire of 31 guage and of 500 turns. Both are fixed permanently on a clear plastic base with connecting terminals. An iron core is introduced inside both coils to increase the effect. One can observe the emf induced in secondary by the deflection produced in galvanometer connected to it by passing current through primary coil.
 
 
Flemings Right Hand Rule
Demonstrates the basic principle of generators. Apparatus consist of a coil made from a copper wire wound on a plastic bobbin. This coil is suspended in between two ring magnets which are fixed permanently on a clear plastic base.

After connecting the terminals of the coil to the galvanometer, give a push to the coil and you will observe deflection in galvanometer. Stretch the fore finger, thumb and middle finger of your right hand such that they are mutually perpendicular to each other. Now you can relate this to the direction of the magnetic field, motion of the coil (conductor) and direction of emf induced
 
 
AC / DC Generator
This model helps you to understand how mechanical energy is being converted into electrical energy. This model has provision to show how both alternating current and direct current are produced by rotating an armature in a magnetic field. The AC and DC generated in this model can be observed by connecting a galvanometer at suitable terminals (Galvanometer not included).
 
 
Working Of A Diode
Diode s are components that allow  current to flow in only one direction. They have a positive and negative side. When the voltage on the positive side is higher than that of negative side, the current flows through the diode. When voltage is lower on positive side than the negative side, then the current does not  flow. Using this simple model you can verify the same.
 
 
Halfwave And Fullwave Rectifier
 
 
 
Baising Of A Transistor
Transistor raises  the strength of weak signal and thus acts as a amplifier. The weak signal is amplified between emitter base junction and output is taken across the load connected in the collector circuit. This simple model  allows you to verify the amplification action of the transistor
 
 
PN Junction (Forward Biased Characterisitcs)  
We know that resister is used to control current in the circuit. A very high resistance allows very little current to flow. A low resistance allows a large amount of current to flow. This model allows you to verify the same
 
 
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