CN216697601U

CN216697601U - Current work-doing teaching experiment demonstration device

Info

Publication number: CN216697601U
Application number: CN202123316415.4U
Authority: CN
Inventors: 张馨允; 江德华
Original assignee: Fujian Changting Longyu Middle School; Fujian Educational Equipment Industry Association; Fujian Education Equipment And Infrastructure Center
Current assignee: Fujian Changting Longyu Middle School; Fujian Educational Equipment Industry Association; Fujian Education Equipment And Infrastructure Center
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-06-07
Anticipated expiration: 2031-12-27

Abstract

The utility model discloses a current working teaching experiment demonstration device in the technical field of teaching experiment demonstration devices, which comprises a vertically arranged demonstration board, wherein the front surface of the demonstration board is provided with a mounting bearing board, two motors are arranged on the left side and the right side of the mounting bearing board side by side, front side output shafts of the two motors are provided with cotton spools, cotton wires for hanging hook codes are wound on the cotton spools, the two sides of the front surface of the demonstration board are respectively provided with a built-in battery and a digital current voltmeter capable of switching and detecting current or voltage, a scale ruler is vertically arranged between the two motors, the device also comprises a power connector and a power supply switch for controlling power supply, the two motors are electrically connected with the power supply switch through wires, the utility model better ensures that students understand that the work done by current is in direct proportion to the current, the voltage and the power-on time, and improves the current working measured by brightness of a sense evaluation lamp in the past, there is no specific data analysis deficiency.

Description

Current work-doing teaching experiment demonstration device

Technical Field

The utility model relates to the technical field of teaching experiment demonstration devices, in particular to a current work doing teaching experiment demonstration device.

Background

In the experimental course of "doing work with current" in middle school physics at present, regarding the contents of understanding the current doing work, there is only one sentence about which factors the current doing work is related to? Scientists have found through extensive research that: the work done by the current is proportional to the current, voltage and time of energization ". In this sentence alone, it is very difficult for students to understand the content thoroughly. The experiment research is necessary to let students understand from a qualitative point of view that the current work is related to the current, the voltage and the power-on time. In the past, two small bulbs with different specifications are used for conducting a research experiment about factors related to current work, the small bulbs are analyzed when the current work is directly proportional to the power-on time, the longer the power-on is, the longer the small bulbs work, the more the power consumption is, the more the current work is, and the obvious defect that the experiment phenomenon is insufficient exists.

Based on the above, the utility model designs a current work-doing teaching experiment demonstration device to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a current work teaching experiment presentation device to solve above-mentioned technical problem.

In order to realize the purpose, the utility model provides the following technical scheme: the utility model provides a current work teaching experiment presentation device, is including erectting the show board that is provided with, the front of show board is provided with the installation loading board, be provided with two motors about on the installation loading board side by side, the front side output shaft of two motors is provided with the cotton spool, the last winding of cotton spool is provided with the cotton thread that is used for hanging hook sign indicating number, the positive both sides of show board are provided with built-in battery respectively and the changeable digital current voltmeter that detects electric current or voltage, erect between two motors and are provided with the scale, still include the power connection with external power supply electric connection and the power switch of control power supply break-make, two the motor passes through wire and power switch electric connection.

Preferably, the specifications of the two motors are rated voltage 12V, rated rotating speed 2500r/min and rated voltage 24V, rated rotating speed 3500r/min respectively; the power supply lines of the two motors are connected in series, the two digital current voltmeters are in a voltage detection mode, and are respectively connected and detected through detection ends to detect the voltages of the positive electrode and the negative electrode of the two motors.

Preferably, the specifications of the two motors are rated voltage 24V, rated rotating speed 3500r/min and rated voltage 24V, rated rotating speed 5000r/min respectively; the power supply lines of the two motors are connected in parallel, and the two digital current voltmeters are in a current detection mode and are respectively connected and detected through detection ends to detect the current flowing through the two motors.

Preferably, the lower end of the cotton thread is connected with a chain for hanging the hook code.

Preferably, four corners of the back of the display board are embedded with strong magnets.

Compared with the prior art, utility model's beneficial effect does:

when the current work doing teaching experiment demonstration device is applied, two motors with different specifications are electrified, the motors rotate by applying work through current work, the motors rotate to lift the hook codes to do work, the same hook codes are observed to be lifted at different heights, the difference of the work doing of the hook codes by the two motors is known through W (equal to Gh), namely the current work doing is different, and meanwhile, the currents or voltages corresponding to the motors are measured to perform contrastive analysis. The exploration process can record the hook code gravity, the hook code rising height, and the current or voltage of the motor. Experimental analysis there are specific data to calculate and compare. The students can conveniently understand that the current work doing is related to the current and the voltage.

The utility model enables students to better understand that the work done by the current is in direct proportion to the current, the voltage and the power-on time; the defects that no research experiment exists in a textbook, the current working is measured according to the brightness of a sense evaluation lamp in the past, and no specific data analysis exists are overcome.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive work.

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic view of the backside structure of the present invention;

FIG. 3 is a wiring diagram of the present invention during voltage testing;

FIG. 4 is a wiring diagram of the present invention during electrical testing.

In the drawings, the components represented by the respective reference numerals are listed below:

the method comprises the following steps of 1-a display board, 2-a mounting bearing board, 3-a motor, 4-a cotton reel, 5-cotton, 6-a digital current voltmeter, 7-a graduated scale, 8-a power supply connector, 9-a power supply switch, 10-a chain and 11-a strong magnet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

Referring to fig. 1-4, the utility model provides a technical solution: a current working teaching experiment demonstration device comprises a display board 1 which is vertically arranged, four corners of the back of the display board 1 are embedded with strong magnets 11, the display board is convenient to be adsorbed and fixed on a blackboard or a metal plate so as to be displayed, a mounting bearing plate 2 is arranged on the front of the display board 1, two motors 3 are arranged on the left side and the right side of the mounting bearing plate 2 side by side, front output shafts of the two motors 3 are provided with cotton spools 4, cotton threads 5 are wound on the cotton spools 4, the lower ends of the cotton threads 5 are connected with chains 10 for hanging hook codes, digital current voltmeters 6 which are internally provided with batteries and can switch detection current or voltage are respectively arranged on two sides of the front of the display board 1, a scale 7 is vertically arranged between the two motors 3, and the device also comprises a power connector 8 which is electrically connected with an external power supply and a power supply switch 9 for controlling the on-off of the power supply, the two motors 3 are electrically connected with the power supply switch 9 through wires; when the current work doing teaching experiment demonstration device is applied, two motors with different specifications are electrified, the motors rotate by applying work through current work, the motors rotate to lift the hook codes to do work, the same hook codes are observed to be lifted at different heights, the difference of the work doing of the hook codes by the two motors is known through W (equal to Gh), namely the current work doing is different, and meanwhile, the currents or voltages corresponding to the motors are measured to perform contrastive analysis. The exploration process can record the hook code gravity, the hook code rising height, and the current or voltage of the motor. Experimental analysis there are specific data to calculate and compare. The students can conveniently understand that the current work doing is related to the current and the voltage.

Example 1:

on the basis of the basic experimental device, the specifications of the two motors 3 are rated voltage 12V, rated rotating speed 2500r/min and rated voltage 24V, rated rotating speed 3500r/min respectively; the power supply lines of the two motors 3 are connected in series, the two digital current voltmeters 6 are in a voltage detection mode, and are respectively connected and detected through detection ends to detect the voltages of the positive electrode and the negative electrode of the two motors 3; the wiring is shown in FIG. 3;

the cotton threads 5 in the two cotton thread shafts are firstly put down by proper length, hook codes with the mass of 50g are respectively hung at the tail ends, the height is adjusted through the positions of the hook codes on the small rings of the chain 10, the tail ends of the hook codes are aligned to the zero scale lines of the scale ruler 7, and the digital current voltmeter 6 is adjusted to be in a voltage detection mode. Two motors 3 with different specifications are connected in series on the display board 1, so that the control current and the electrifying time are the same. The power supply connector 8 is connected by a 24V power line, and the power supply switch 9 is closed. The two digital current-voltage meters 6 measure the voltage values of the two motors 3, respectively, and the read voltage values are recorded in the tables. After the power is on for a period of time, the power supply switch 9 is switched off, the two motors 3 respectively lift the hook codes with the same mass to different heights, the lifting heights of the hook codes are directly read through the suspended scale 7, and the lifting heights of the two hook codes are recorded in the following table 1. Analyzing the data of the table, the motor 3 with large voltage can lift the hook code to be higher, thereby drawing the conclusion that: the magnitude of the work done by the current is related to the voltage across it.

Table 1: hook code rising height and motor voltage data recording table in current work doing experiment

Electric motor	Motor	1	Motor 2
				Voltage U/V
The rising height h/cm of the hook code

Example 2:

on the basis of the basic experimental device, the specifications of the two motors 3 are rated voltage 24V, rated rotating speed 3500r/min and rated voltage 24V, rated rotating speed 5000r/min respectively; the power supply lines of the two motors 3 are connected in parallel, and the two digital current voltmeters 6 are in a current detection mode and are respectively connected through detection ends to detect the current flowing through the two motors 3; the wiring is shown in FIG. 4;

the cotton threads 5 in the two cotton thread shafts are firstly put down by proper length, hook codes with the mass of 50g are respectively hung at the tail ends, the height is adjusted through the positions of the hook codes on the small rings of the chain 10, the tail ends of the hook codes are aligned to the zero scale lines of the scale ruler 7, and the digital current voltmeter 6 is adjusted to be in a voltage detection mode. Two motors 3 with different specifications are connected in series on the display board 1, so that the control current and the electrifying time are the same. The power supply connector 8 is connected by a 24V power line, and the power supply switch 9 is closed. Two digital current-voltage meters 6 measure the current values passing through the two motors 3, respectively, and the read current values are recorded in a table. After the power is on for a period of time, the power supply switch 9 is switched off, the two motors 3 respectively lift the hook codes with the same mass to different heights, the lifting heights of the hook codes are directly read through the suspended scale 7, and the lifting heights of the two hook codes are recorded in the following table 2. Analyzing the data of the table, the motor 3 with large current can lift the hook code to be higher, thereby drawing the conclusion that: the magnitude of the work done by the current is related to the current passing through.

Table 2: hook code rising height and motor current data recording table in current work doing experiment

Electric motor	Motor	1	Motor 2
				Current I/A
The rising height h/cm of the hook code

Example 3

The device power supply circuit is connected with and selected from a figure 4, cotton threads 5 of a motor 3 are firstly put down by a proper length, a hook code with the mass of 50g is hung on a tail end chain 10, the height is adjusted by the position of the hook code on a small ring of the chain, the tail end of the hook code is aligned to the zero scale mark of a scale 7, a switch of a battery box is closed, and a digital current voltmeter 6 is in a current detection mode. The power is connected by a 24V power line, and the switch is closed. The timing is carried out by using a stopwatch, the motor 3 is electrified for 5 seconds, the lifting height of the motor 3 to the hook code is observed, the lifting height of the hook code is directly read through a suspended graduated scale 7, and the lifting height of the hook code is recorded in the following table 3; and then the motor is electrified for 10 seconds, the lifting height of the motor 3 to the hook code is observed, the lifting height of the hook code is directly read through the suspended graduated scale, and the lifting height of the hook code is recorded in the following table 3. Analyzing the tabular data to further analyze and summarize: the current work is related to the power-on time.

Table 3: hook code rising height and motor power-on time data recording table in current work doing experiment

Electric motor	Motor	1	Motor 1
				Energization time t/s
The rising height h/cm of the hook code

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; the term "connected" may refer to a direct connection, an indirect connection through an intermediate, a connection between two elements or an interaction relationship between two elements, and unless otherwise specifically defined, the term should be understood as having a specific meaning in the present application by those skilled in the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a current work teaching experiment presentation device which characterized in that: including the show board (1) of erectting to be provided with, the front of show board (1) is provided with installation loading board (2), installation loading board (2) are gone up the left and right sides and are provided with two motor (3) side by side, and the front side output shaft of two motor (3) is provided with cotton spool (4), it is provided with cotton thread (5) that are used for hanging the hook sign indicating number to roll up on cotton spool (4), the front both sides of show board (1) are provided with built-in battery respectively, and changeable digital current voltmeter (6) of detecting current or voltage, erects between two motor (3) and is provided with scale (7), still include power connection (8) and the power switch (9) of control power supply break-make with outside power supply electric connection, two motor (3) are through wire and power switch (9) electric connection.

2. The current work-doing teaching experiment demonstration device according to claim 1, characterized in that: the specifications of the two motors (3) are rated voltage 12V, rated rotating speed 2500r/min and rated voltage 24V, rated rotating speed 3500r/min respectively; the power supply lines of the two motors (3) are connected in series, the two digital current voltmeters (6) are in voltage detection modes, and are respectively connected and detected through detection ends to detect positive and negative voltages of the two motors (3).

3. The current work-doing teaching experiment demonstration device according to claim 1, characterized in that: the specifications of the two motors (3) are rated voltage 24V, rated rotating speed 3500r/min and rated voltage 24V, rated rotating speed 5000r/min respectively; the power supply lines of the two motors (3) are connected in parallel, and the two digital current voltmeters (6) are in a current detection mode and are respectively connected and detected through detection ends to detect the current flowing through the two motors (3).

4. The current work-doing teaching experiment demonstration device according to claim 1, characterized in that: the lower end of the cotton thread (5) is connected with a chain (10) for hanging hook codes.

5. The current work-doing teaching experiment demonstration device according to claim 1, characterized in that: strong magnets (11) are embedded in four corners of the back of the display board (1).