CN2243695Y

CN2243695Y - Comprehensive demonstration box for electricity knowledge for junior middle school

Info

Publication number: CN2243695Y
Application number: CN 95215766
Authority: CN
Inventors: 刘保国
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-13
Filing date: 1995-07-13
Publication date: 1996-12-25
Anticipated expiration: 2005-07-13

Abstract

The utility model relates to a demonstrating box for electrical experiments in the junior physics. The utility model mainly comprises a box body and an inserting block. One surface of the box body is provided with a transparent organic glass plate, and inserting holes are equidistantly, longitudinally and transversely arranged in the plate. The inserting block is provided with a pair of conical copper pipes, and the copper pipes can be inserted into the inserting holes so as to position the inserting block. The inserting block is provided with electrical apparatus elements such as a fixed value resistor, a variable resistor, a motor, an electric bulb seat, a switch, a coil, an armature iron, a fuse, etc. The inserting block can also be provided with a glued layer with electrical symbol marks, or can be provided with a demonstrating tool such as a test tube. The utility model can be simply, conveniently and visually used for demonstrating various electricity contents in junior middle schools, and the electricity contents comprise the Joule's theorem, the magnetic performance of current, the function of the magnetic field to the current, etc. The utility model is suitable for the countryside middle schools particularly.

Description

Junior middle school's electricity comprehensive demonstration case

The utility model relates to a kind of teaching demonstration apparatus, relates to a kind of demonstration box of junior physics Experiments of Electricity or rather.

The experimental demonstration of junior physics electricity part mainly comprises the magnetic, magnetic field of Joule law, electric current effect, magnetic field demonstration, Ohm law and the series-parallel circuit etc. to electric current.At present, particularly in the junior middle school physics teaching in vast rural area, demonstration equipment is few, the demonstration condition is poor, makes just to compare the more difficult junior middle school student of the being acceptance of abstract concept originally.Demonstration is to fill it up with kerosene and jam-pack bottle stopper with two 250 milliliters flask as Joule law, the bottle stopper punching is inserted thin glass tube and is positioned at the copper conductor of glass tube both sides, two copper conductors are not held the resistance that connects different resistances below glass tube, the back electric energy of switching on changes heat energy into to be made the rising of kerosene temperature and expands the relation that the kerosene liquid level raises and can qualitatively reflect electric current and produce heat in the thin glass tube.Because experiment needs good sealing, and length consuming time, the classroom poor effect.The and for example magnetic of electric current experiment, undertaken by the textbook introduction, promptly hang a spring with iron stand, the spring lower end hangs an iron block, by the solenoid and the energising of placing the different numbers of turn below iron block, situation about being elongated according to spring is come the relation of qualitative sense electric current and magnetic power.Improper during experiment if spring, iron block, solenoid are selected, just do not have expected effect.A circuit board and suspension are adopted in demonstration as Ohm law, circuit connection in series-parallel characteristic etc. usually, couple together onboard and with lead switch, battery, resistance, tube face, motor, reometer, voltage table etc. are fixing, experiment preliminary work is numerous and diverse and consistance side circuit and circuit diagram is poor, is not easy to student's understanding and acceptance.

The purpose of this utility model is the design electricity comprehensive demonstration case of a kind of junior middle school, makes to have to make characteristics simple, with low cost, practical, good demonstration effect, is convenient to junior middle school student's understanding and accepts the electricity notion.

The utility model junior middle school electricity comprehensive demonstration case comprises casing and removable box cover, it is characterized in that:

Described casing simultaneously is transparent poly (methyl methacrylate) plate, the equidistant jack that offers by longitudinal and transverse arrangement on the plate;

Also comprise the inserted block that is provided with electric elements or electrical symbol paste layer or experimental part, the inserted block plane is provided with a pair of for inserting the metallic plug in any two jacks on the described poly (methyl methacrylate) plate.

Described inserted block be provided with fixed value resistance or battery or fuse or variable resistor or motor or tube face or switch or test tube or armature or coil or a pair of perpendicular to the inserted block plane Metallic rod and be positioned at place, centre position, Metallic rod below and the platform vertical with the inserted block plane.

Various electric elements and experimental part, electrical symbol etc. are arranged on the inserted block, utilize on the inserted block any two cooperating of jack on the plug and poly (methyl methacrylate) plate and locate inserted block, and finish needed connection.Only need select corresponding inserted block when changing demo content, under the support of the designed demenstration method of applicant, make demonstration convenient, connect simply, directly perceived, effective, other should not be produced on demonstration accessory on the inserted block and all can be seated in and be easy to carry in the casing and take at any time simultaneously.

Further specify technology of the present utility model below in conjunction with several demonstration examples.

Fig. 1 is junior middle school's electricity comprehensive demonstration box structure synoptic diagram;

Fig. 2 is an inserted block basic structure synoptic diagram;

Fig. 3 is the inserted block structural representation as the demonstration Joule law;

Fig. 4 is the inserted block structural representation as demonstration electric current magnetic;

Fig. 5 is the inserted block structural representation as the demonstration magnetic field acting on electric current.

Referring to Fig. 1, casing 10 is a cuboid, front panel 11 is a transparent plexiglass plate, evenly offer jack 11 on the plate by arranged, case lid 12 is inclination, but folding is also sealed with casing, handle 13 also can be set for guiding and supporting on the casing, and various demonstration articles for use all can place is convenient to teacher's spare part and carrying before the class in the case.Can directly be positioned on the casing inner bottom plating than big article or rest on the box inside plate needn't be specially for fixing for ammeter etc. during demonstration, even also level crossing can be rested on the box inside plate to increase the experiment visibility.Transparent demonstration board can be convenient to the connection of various inserted block elements in the observation of students casing, and the jack in length and breadth of demonstration board equal intervals setting is convenient to connect the inserted block element by horizontal line, vertical line, makes consistent with circuit diagram.

Referring to Fig. 2, the basic structure of inserted block is a rectangular panel blocks 20, makes of insulating material, and plate 20 is provided with two taper copper pipes 21, and the plumbers shed distance is with two jack spacings or its multiple on the casing poly (methyl methacrylate) plate.Taper copper pipe 21 can closely insert in the jack 111 with the location inserted block.Can fix various electric elements such as resistance, tube face, switch, armature, coil etc. on the inserted block, also can fix demonstration with article such as test tube, Metallic rod, platform etc., also Pasting as ten, one, electrical symbol layers such as V, A.

Referring to Fig. 3, when utilizing comprehensive demonstration case of the present utility model to demonstrate Joule law, desirable two test tube inserted blocks are inserted in the casing poly (methyl methacrylate) plate jack fixing, and in two test tubes, add equivalent kerosene, two equivalences and non-equivalence resistance wire stretched into respectively in the test tube kerosene and with plug be connected, the penoncel handle that scribbles the wind intellectual circle is bonded on the test tube wall, two inserted blocks insert in the power circuit by requirement of experiment, can produce the notion of heat in the resistance wire after the energising according to the situation qualitative sense electric current that the flag handle falls down because of wind intellectual circle melted by heat, this experiment changes over the heat transmission method of demonstration with thermal expansion demenstration method in the past, and is directly perceived simple.

Referring to Fig. 4, utilize the magnetic of comprehensive demonstration case demonstration electric current of the present utility model, desirable armature inserted block and coil, iron core demonstration.Armature on the armature inserted block can be provided with pointer on the armature around the deflection of O point.Get the less coil of a number of turn and place armature one side and insert power circuit by inserted block, change electric current in the coil, armature deflection is according to the relation of deflection angle qualitative sense magnetic field power with electric current.

Opposite side at above-mentioned inserted block armature is provided with the more coil of another number of turn again, two coils are connected in series on inserted block, increasing electric current gradually can observe armature and by which coil attracted, insert iron core this moment again in the coil that can not attract (number of turn is few), armature is attracted and deflection by this coil then, the power that attracts armature deflection to need in the above-mentioned demonstration is far smaller than the power that attracts the iron block extension spring, therefore demonstrates the success ratio height.

Referring to Fig. 5, utilize of the effect of comprehensive demonstration case demonstration of the present utility model magnetic field to electric current, inserted block is provided with perpendicular to the pair of metal bar 51 of inserted block flat board and platform 52 platforms, 52 and is positioned at two Metallic rod, 51 belows and mediates, and two Metallic rod are connected with two plugs respectively.Put a needle on the platform 52, inserted block needs to insert in the power circuit by experiment, can do the oersted experiment with lead short circuit two Metallic rod above the platform needle.The lead of short circuit Metallic rod is replaced with the goldleaf paper roll, changes pointer on the platform into U type magnet, and make paper roll pass the hollow part of U sections, paper roll rotates the effect of demonstration magnetic field to electric current.The square coil two ends are held on respectively on two Metallic rod, the U type magnet hollow part on the platform is passed in the coil bottom, can demonstrate magnetic induction and left-hand rule again.

Utilize comprehensive demonstration case of the present utility model, be equipped with suitable ammeter, low-tension supply etc., can in case, finish the demonstration of electrification by friction, two kinds of electric charges, conductor and insulator characteristics; The demonstration of three kinds of effects of electric current; The demonstration that assembling series-parallel circuit, reometer, voltage table use; The relation of demonstration strength of current and voltage; Demonstrate rheostatic structure and effect, the acting of demonstration electric current; Measure the electric power that electrical appliance consumes; The demonstration Joule law; The experiment of demonstration oersted; The magnetic of research energization solenoid; Make the effect of electromagnet and demonstration electromagnet; Make electromagnetic relay, make electric bell; Demonstration magnetic field is to the effect of electric current; Assembling direct current drive machine model; Demonstrating electromagnetic induction; Make household appliances power supply connecting circuit; The effect of demonstration fuse; The phenomenon that total current increases with electrical appliance power in the illustrative circuitry etc.

The advantage of this integrated box is: the box design is easy to carry, and various demonstration articles for use are put into case and can be locked; Experimental situation in the good case is arranged, be convenient to the incandescent lamp baking, make test not be subjected to the impact of humid climate; Circuit Demonstration board is transparent, and is attractive in appearance and easy to use, directly perceived, and each element connects very clear, is convenient to equidistant weak point Lead connects, and does not have oblique line to only have horizontal line, vertical line, makes circuit consistent with circuit diagram. An integrated box adds Some inserted blocks almost can be finished the qualitative demonstration of whole junior physics electrical principles, phenomenon, need not support, Hang etc.

Claims

1, a kind of junior middle school electricity comprehensive demonstration case comprises casing and removable box cover, it is characterized in that:

2, junior middle school according to claim 1 electricity comprehensive demonstration case is characterized in that: described inserted block be provided with fixed value resistance or battery or fuse or variable resistor or motor or tube face or switch or test tube or armature or coil or a pair of perpendicular to the inserted block plane Metallic rod and be positioned at place, centre position, Metallic rod below and the platform vertical with the inserted block plane.