Тема урока: "Electric current. Ammeter"

Разделы: Физика, Иностранные языки, Конкурс «Презентация к уроку»


Презентация к уроку

Загрузить презентацию (4,7 МБ)

Внимание! Предварительный просмотр слайдов используется исключительно в ознакомительных целях и может не давать представления о всех возможностях презентации. Если вас заинтересовала данная работа, пожалуйста, загрузите полную версию.


Stage Time Teacher’s actions Students’ actions
Org. Moment 1' Greetings

Divide students into three groups according to the color of a paper students take from the box.

During the lesson teams earn points and in the end of the lesson according to the results students get marks.

Students take a colored paper from the box and sit at the table relatively
Warm up 1' 1. Showstermsontheboard:

Электрический ток

Направление электрического тока

Постоянный и переменный ток

Источники тока

Действие электрического тока

Электрическая цепь

Напряжение

Положительный и отрицательный электрические заряды

Translate terms

Electric current

direction of electric current

direct and alternating current

sources of electricity

effects of electric current

Electric circuit

Voltage

Positive and negative electric charge

Revision 10'' Tells the task: “You have a list of questions and 3 minutes for preparation. Your teams will answer one by one, but every next answer should be given another student in the team” team gets a point for every correct answer.

Appendix 1

Describe the figure.

Fill in the gap.

Electric current is the motion of electrons

Electric circuit is a sourceof electricity, wires and devices

Current may be of two types:direct andalternating.

4.What effects of electric current do you know?

5. What are conditions for current in a circuit?

6. Tell about unusual electric source. (Lemon or salty cucumber)and show it with the help of equipment

 

Checks the correctness of task after each exercise

 

 

 

Students describe the figure

2.Students write on the board

Students’ answer:

4. Heat, physiological, magnet and chemical

Students’ answer:

5.Free electrons, source of electricity, electric field

6.Describes the source of electricity based on lemon. Zink plate (wide) and carbon rod are connected to the ammeter. They are put inside the lemon. The pointer moves and shows current in a circuit

Main part

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Practice

10'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5'

 

 

 

 

 

 

 

 

 

 

8'

 

 

 

 

5'

 

 

 

 

 

 

 

2'

Current

Presentation of the theme.

Current is the amount of charge passing through a point in the circuit in one second.

I - Current (A)

q – Charge (C)

1t – time (s)

1A = 1Coulomb|1 second

Caution!

1A is dangerous for life!

Ammeter is the device for measuring current

Asks students to draw and make a circuit in groups using bulb, wires,ammeter,switch. The quickest and correct circuit brings point to the team.

Solve the problem

Solve these problems on the poster and stick them to the board. Students and teacher checks together and teams get points

Appendix2

1.Find current in electric bulb, if electric charge of 300C travels through it during 10min.

2.What charge will travel during 3min through ammeter if current is 0.2A?

3.Current is 200A. What is the time the charge of 60000C travels through it?

4. Current in the iron is 0.2A. What charge will travel through it during 5 min?

4.Self – checking test

Look at the board, teacher reads question from the slide, students write answers in the exercise-book. After writing the test they take neighbor’s exercise-book and check it with the red pen

Test:

Current is...

Ammeter is...

What circuit is correct?

A charge of 3.6*104C passes through a bulb in 1 hour. What current is passing through the bulb?

An amount of 1020 electrons pass through the cross section of a wire in 8 s. What is the current passing through the wire ? (take e=1.6*10-19C)

Answers: 1b.2c.3c.4a.5c

Write information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Make a circuit experimentally

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Students solve problems in groups and stick them to the board (they use colorful markers and write with large letters )

The contrary groups check solutions

 

 

 

 

 

Students fulfill the test exchange papers and check their neighbors.

Home Assignment 1' # 36 ex14 #1.2.3.4 (wr)
Giving feedback and assessment 2' Today we have revised terms electric current, current sources. Also we have made a circuit and we can solve problems on the theme “Current”

You did a good job!

Appendix 1 REVISION QUESTIONS:

Describe figure on the slide:

11

Electric current is the motion of _______

Electric circuit is _________of electricity, _________ and ___________

Current may be of two types:_______________and______________.

What effects of electric current do you know?

What are conditions for currentin a circuit?

Tell about unusual electric source. (Lemon or salty cucumber)

Appendix 2

Practice:

Solve problems and write formula and solution on the poster.

Find current in electric bulb, if electric charge of 300C travels through it during 10min.

What charge will travel during 3min through ammeter if current is 0.2A?

Current is 200A. What is the time the charge of 60000C travels through it?

Current in the iron is 0.2A. What charge will travel through it during 5 min?