Laboratory works→ number 1

Equipment: power supply, light bulb on stand, ammeter, key, connecting wires.

Instructions for performing the work

1. Consider an ammeter. Pay attention to the “+” and “-” signs at its clamps. Draw the ammeter scale (without the arrow) in your notebook. Determine the division price of the device.

2. Draw a diagram of an electrical circuit consisting of series-connected devices listed in the equipment list. Collect this chain. To do this, place all the devices on the table in the same order as they are shown in the diagram, and then connect them with wires.

3. Measure the current in the circuit. On the ammeter scale that was drawn in your notebook, draw an arrow indicating the corresponding current strength. Write down the ammeter readings in your notebook.

4. Measure the current on another section of the circuit. To do this, turn off the power source, move the ammeter to another location in the circuit, and turn the circuit back on. Compare the ammeter reading with the previous one. Draw a conclusion.

The first work in the laboratory workshop is very simple and will not take you much time. In it you will assemble a simple serial electrical circuit and measure the current in its various sections using an ammeter. Since the circuit is series, it should be expected that the current strength measured in different sections is the same (within the error). If this is not the case, then this means that you made a mistake and you should redo the work.

Example of doing the job:

Ammeter division value:

Ammeter readings in the first case: I1 = 0.5 A. Ammeter readings in the second case: I2 = 0.5 A.

Conclusion: the current strength in different sections of the series circuit is the same.

Grigorieva Elena Alekseevna

02.01.2016

Lesson topic

Ammeter. Current measurement. Laboratory work No. 4.

Target

Introducing students to a device for measuring current strength - an ammeter; developing skills in assembling an electrical circuit; skills in determining the division value, the measurement limit of an ammeter, its correct inclusion in a circuit and its use to measure current.

Tasks

1) Find out how to measure current strength; 2) learn how to correctly connect an ammeter to an electrical circuit and measure current strength with it; 3) perform laboratory work on assembling an electrical circuit and measuring the current strength in its various sections.

Lesson type Combined lesson.

Lesson form

Traditional lesson with elements of exploration.

Teaching methods

Visual, practical, inductive, laboratory work, frontal questioning.

Form of organization of students' educational activities

Group, frontal.

Equipment

Power supply, low-voltage lamp on a stand, key, ammeter, connecting wires; textbook, computer, projector, demonstration ammeter.

Planned results

1) At the memorization level: name the elements of an electrical circuit, ammeter; reproduce the definitions of electric current, current strength. 2) At the level of understanding: understand how to connect an ammeter to an electrical circuit. 3) At the level of application in typical situations: assemble an electrical circuit, use an ammeter to determine the current strength in an electrical circuit, draw electrical circuit diagrams; be able to perform experiments, analyze and evaluate the results of the experiment.

Lesson steps:

3 Repetition of material

4 New material

1 Organizational moment: greeting, checking the emotional mood of students.

(2 minutes)

Hello guys! Our lesson today will be held under the motto: “And apple trees will bloom on Mars”! I would like you to be attentive, correct and friendly, as you will need to work in pairs.

Slide 1. Greetings.

2 Homework. Paragraph 38, ex. 25.

(3 min)

Paragraph 38, ex. 25.

Slide 2. Homework.

3 Repetition of material

(5 minutes)

Let's repeat the material that will help you and I remember what activates your brain activity.

Slide 3. Current strength. Control

Check with each other how well you did the job and draw a smiley face that matches your assessment.

4 New material

(10 min)

Today we will get acquainted with an electrical measuring device that allows you to measure the current strength in an electrical circuit - an ammeter.

Slide 4. Ammeters

An ammeter is a device for measuring current in a circuit. Its structure and operating principle are similar to a galvanometer. Its work is based on the magnetic action of current. Let us determine the division value, the measurement limit of the ammeters shown in the figures.

Slide 5. Connecting an ammeter to a circuit and its designation on the diagram

Rules for using an ammeter. 1) Connected in series. 2) Switching is done using two terminals “+” and “-”. 3) The terminal with the “+” sign is connected to the “+” source, “-” to the “-”. 4) Protect the device from shock, shaking and dust.

Slide 6. Measuring current strength

Let's assemble a virtual electrical circuit and measure the current.

Slide 7. Current measurement

Let's make the necessary notes in the virtual notebook.

5 Performing laboratory work No. 4 “Assembling an electrical circuit and measuring the current strength in its various sections.”

(20 minutes)

Now we proceed directly to performing laboratory work No. 4 as described in the textbook, page 224.

WITH
slide 8. tutorial_225

Slide 9. textbook_226

Sources used

Textbook "Physics. 8th grade" Peryshkin A. V. M. "Bustard" 2014.

Technological map of the lesson.

Item: physics

Class 9A ( hearing impaired children)

Teacher: Kishchenko Lidiya Mikhailovna

Subject: Current measurement. Laboratory work No. 3 “Assembling an electrical circuit and measuring the current strength in its various sections.”

Target: Formation of skills in assembling an electrical circuit; strengthening the skills of determining the division value, the measurement limit of an ammeter, its correct inclusion in a circuit and its use to measure current.

Tasks: 1) Find out how to measure current strength; 2) learn how to correctly connect an ammeter to an electrical circuit and measure current strength with it; 3) perform laboratory work on assembling an electrical circuit and measuring the current strength in its various sections.

Lesson type : Combined lesson.

Teaching methods: Visual, practical, inductive, laboratory work, frontal questioning.

Form of organization of educational activities of students: Group, individual.

Equipment: power supply, low-voltage lamp, key, ammeter, connecting wires; textbook, computer, projector.

Planned results:

Learn to assemble an electrical circuit, use an ammeter to determine the current strength in an electrical circuit, draw electrical circuit diagrams; be able to perform experiments, analyze and evaluate the results of the experiment.

Types of independent work:

Preparation of presentations or reports “Electric field” in my future profession.

Preparation of presentations or reports “Electromagnetic phenomena” in my future profession.

Literature:

Myakishev G.Ya., Bukhotsev B.B. Physics 10 M.: Enlightenment. 2000, from 91-128,133-146,150-162

Myakishev G.Ya., Bukhotsev B.B. Physics 11 M.: Enlightenment. 2000, from 4-19, 94-129

Dmitrieva V.F. Physics: Textbook for secondary specialized educational institutions M.: Academy, 2010, p.117-138

Means of education:

Topic 1.4. Atomic structure and quantum physics

Knowledge requirements:

mechanism of thermal radiation;

quantum nature of light, Planck's hypothesis;

laws of external photoelectric effect;

Einstein's equation for the photoelectric effect, light pressure;

the essence of Rutherford's experiments, the model of the atom of Rutherford and Bohr, the composition of the atomic nucleus;

experimental methods for recording charged particles;

the essence of radioactivity, the composition of radioactive radiation and its characteristics;

the physical essence of the nature of nuclear forces and mass defect;

mechanism of fission of heavy atomic nuclei, operating principle of a nuclear reactor;

development of nuclear energy and environmental problems;

the essence of thermonuclear fusion;

achievements of scientists in solving the problem of controlled thermonuclear reaction, the structure of the sun and stars, the main stages of the evolution of stars.

Skill Requirements:

solve problems using the photoelectric effect equation to calculate the energy and momentum of a photon;

formulate Bohr's postulates;

explain the properties of elementary particles;

solve problems on using the law of radioactive decay, on using the mass defect and binding energy in the nucleus, on drawing up equations of nuclear reactions;

calculate the energy yield of a thermonuclear reaction;

solve problems on maintaining the energy balance during thermonuclear reactions.

Photoelectric effect and corpuscular properties of light. Use of the photoelectric effect in technology. Structure of the atom: planetary model and Bohr model. Absorption and emission of light by an atom. Quantization of energy. Operating principle and use of laser.

The structure of the atomic nucleus. Radioactive radiation and its effect on living organisms. Energy of fission of an atomic nucleus. Nuclear energy and environmental problems associated with its use.

Demonstrations

Photo effect.

Photocell.

Laser radiation.

Ionizing radiation counter.

Types of independent work:

Compilation of a reference summary “Structure of the Atom”

Literature:

Myakishev G.Ya., Bukhotsev B.B. Physics 11 M.: Enlightenment. 2000, from 160-170, 185-220

Dmitrieva V.F. Physics: Textbook for secondary specialized educational institutions M.: Academy, 2010, pp. 348-362,367-412

Means of education: Necessary equipment for laboratory work, Interactive whiteboard, PC, slide presentations.

Section 2. Chemistry with environmental elements

Topic 2.1 Water, solutions

Knowledge requirements:

water and its biological role;

the role of water in the life of cells and organisms;

water cycle in nature;

chemical and physical properties of water;

dissolution of substances in water;

water resources of the Earth;

use of water in industry, agriculture and everyday life;

• water pollution, treatment methods;

  water desalination;

Skill Requirements:

determination of contaminants in water;

determination of water hardness and ways to eliminate it;

properties of water;

minerals.

Water is all around us. Physical and chemical properties of water. Dissolution of solids and gases. The mass fraction of a substance in a solution as a way of expressing the composition of the solution.

Water resources of the Earth. Water quality. Water pollutants and treatment methods. Hard water and its softening. Water desalination.

Demonstrations Physical properties of water: surface tension, wetting. Dependence of solubility of solids and gases on temperature. Methods for separating mixtures: filtration, distillation, separating funnel.

Laboratory work No. 6.Preparation of solutions with a given mass fraction of dissolved substance.

Laboratory work No. 7.Purification of contaminated water.

Types of student independent work: Prepare a project for saving domestic water consumption. What information do labels on mineral water bottles carry?

Literature: Gabrilyan O.S. Chemistry. – M..: Bustard, 2009 -223 p.

Means of education: diagram of the water cycle in nature; transparent flat-bottomed glass cylinder, 2-2.5 cm in diameter, 30 - 35 cm high, 250 ml measuring cylinder, distilled water.

Types of independent work:

Preparation of presentations or reports “Electric field” in my future profession.

Preparation of presentations or reports “Electromagnetic phenomena” in my future profession.

Literature:

Myakishev G.Ya., Bukhotsev B.B. Physics 10 M.: Enlightenment. 2000, from 91-128,133-146,150-162

Myakishev G.Ya., Bukhotsev B.B. Physics 11 M.: Enlightenment. 2000, from 4-19, 94-129

Dmitrieva V.F. Physics: Textbook for secondary specialized educational institutions M.: Academy, 2010, p.117-138

Means of education:

Topic 1.4. Atomic structure and quantum physics

Knowledge requirements:

mechanism of thermal radiation;

quantum nature of light, Planck's hypothesis;

laws of external photoelectric effect;

Einstein's equation for the photoelectric effect, light pressure;

the essence of Rutherford's experiments, the model of the atom of Rutherford and Bohr, the composition of the atomic nucleus;

experimental methods for recording charged particles;

the essence of radioactivity, the composition of radioactive radiation and its characteristics;

the physical essence of the nature of nuclear forces and mass defect;

mechanism of fission of heavy atomic nuclei, operating principle of a nuclear reactor;

development of nuclear energy and environmental problems;

the essence of thermonuclear fusion;

achievements of scientists in solving the problem of controlled thermonuclear reaction, the structure of the sun and stars, the main stages of the evolution of stars.

Skill Requirements:

solve problems using the photoelectric effect equation to calculate the energy and momentum of a photon;

formulate Bohr's postulates;

explain the properties of elementary particles;

solve problems on using the law of radioactive decay, on using the mass defect and binding energy in the nucleus, on drawing up equations of nuclear reactions;

calculate the energy yield of a thermonuclear reaction;

solve problems on maintaining the energy balance during thermonuclear reactions.

Photoelectric effect and corpuscular properties of light. Use of the photoelectric effect in technology. Structure of the atom: planetary model and Bohr model. Absorption and emission of light by an atom. Quantization of energy. Operating principle and use of laser.

The structure of the atomic nucleus. Radioactive radiation and its effect on living organisms. Energy of fission of an atomic nucleus. Nuclear energy and environmental problems associated with its use.

Demonstrations

Photo effect.

Photocell.

Laser radiation.

Ionizing radiation counter.

Types of independent work:

Compilation of a reference summary “Structure of the Atom”

Literature:

Myakishev G.Ya., Bukhotsev B.B. Physics 11 M.: Enlightenment. 2000, from 160-170, 185-220

Dmitrieva V.F. Physics: Textbook for secondary specialized educational institutions M.: Academy, 2010, pp. 348-362,367-412

Means of education: Necessary equipment for laboratory work, Interactive whiteboard, PC, slide presentations.

Section 2. Chemistry with environmental elements

Topic 2.1 Water, solutions

Knowledge requirements:

water and its biological role;

the role of water in the life of cells and organisms;

water cycle in nature;

chemical and physical properties of water;

dissolution of substances in water;

water resources of the Earth;

use of water in industry, agriculture and everyday life;

• water pollution, treatment methods;

  water desalination;

Skill Requirements:

determination of contaminants in water;

determination of water hardness and ways to eliminate it;

properties of water;

minerals.

Water is all around us. Physical and chemical properties of water. Dissolution of solids and gases. The mass fraction of a substance in a solution as a way of expressing the composition of the solution.

Water resources of the Earth. Water quality. Water pollutants and treatment methods. Hard water and its softening. Water desalination.

Demonstrations Physical properties of water: surface tension, wetting. Dependence of solubility of solids and gases on temperature. Methods for separating mixtures: filtration, distillation, separating funnel.

Laboratory work No. 6.Preparation of solutions with a given mass fraction of dissolved substance.

Laboratory work No. 7.Purification of contaminated water.

Types of student independent work: Prepare a project for saving domestic water consumption. What information do labels on mineral water bottles carry?

Literature: Gabrilyan O.S. Chemistry. – M..: Bustard, 2009 -223 p.

Means of education: diagram of the water cycle in nature; transparent flat-bottomed glass cylinder, 2-2.5 cm in diameter, 30 - 35 cm high, 250 ml measuring cylinder, distilled water.