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Electric current. Ammeter.
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
develop the ability to work with electric material.
develop problems solving skills
develop logical, thinking, and intellectual abilities:
enlarge students’ outlooks; acquire a habit to work individually, and in groups.
1. know current;
2. make a circuit experimentally;
3. solve problems
4. know how to work individually;
Symbols of circuit, current I=q/t, ammeter
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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
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1. Shows terms on the board:
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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
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.
4. Heat, physiological, magnet and chemical
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
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Current is the amount of charge passing through a point in the circuit in one second.
I - Current (A)
q – Charge (C)
t – time (s)
1A is dangerous for life!
Ammeter is the device for measuring current
Solve these problems on the A3 papers and stick them to the board
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
“5” – five correct answers
“4” – four correct answers
“3” – three correct answers
“2” – two correct answers
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.
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# 36 ex14 #188.8.131.52 (wr)
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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:
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 current in a circuit?
Tell about unusual electric source. (Lemon or salty cucumber)
Solve problems and write formula and solution on the A3 Paper.
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?