Урок по физике Electric current. Ammeter

Subject:			term:	date:		form:
Physics			3			8
Theme: Electric current. Ammeter.
Resources: Basharuly B.A. Physics -8 Kirik L.A. Samostoyatelnye raboty po fizike. Presentation Electric equipment: ammeter, wires, bulb, switch Test
Aims: Educational: revise terms electric current , current sources, construction and principle of work of the current source know symbols of electric circuit, know rules of making the circuit Developing: develop the ability to work with electric material. develop problems solving skills develop logical, thinking, and intellectual abilities: Educative: enlarge students’ outlooks; acquire a habit to work individually, and in groups.
Learning outcome: Students 1. know current; 2. make a circuit experimentally; 3. solve problems 4. know how to work individually;
Core information: Symbols of circuit, current I=q/t, ammeter
PLAN:
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.			Students take a colored paper from the box and sit at the table relatively
Warm up	2	1. Shows terms on the board: 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	6	Tells the task: “You have a list of questions and 2 minutes for preparation. Your teams will answer one by one, but every next answer should be given another student in the team” Appendix 1 Describe the figure. Fill in the gap. Electric current is the motion of electrons Electric circuit is a source of electricity, wires and devices Current may be of two types: direct and alternating. 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 and get a point for every correct answer. 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	32	Current Presentation of the theme. Current is the amount of charge passing through a point in the circuit in one second. [pic] I - Current (A) q – Charge (C) t – time (s) 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. [pic] Solve the problem Solve these problems on the A3 papers and stick them to the board 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 “5” – five correct answers “4” – four correct answers “3” – three correct answers “2” – two correct answers			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. Teams get a point for every correctly solved problem. Students fulfill the test and check their classmates by means of exchanging papers.
Home Assignment	1	# 36 ex14 #1.2.3.4 (wr)
Giving feedback and assessment	3	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:

1. Describe figure on the slide:

[pic]

2. Electric current is the motion of _______

3. Electric circuit is _________of electricity, _________ and ___________

4. Current may be of two types:_______________and______________.

5. What effects of electric current do you know?

6. What are conditions for current in a circuit?

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

Appendix 2

Practice:

Solve problems and write formula and solution on the A3 Paper.

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?