Current Ammeter 1 revise theme current sources construction

Current. Ammeter. 1) revise theme current sources, construction and principle of work of the current source 2) know the meaning of current 3) make electric circuit experimentally and using symbols LOGO

Electric sources revision Translate into English: Электрический ток Направление электрического тока Постоянный и переменный ток 1 4 Источники тока 4 Sources of current 5 Действие электрического тока 5 Effect of electric current 6 Электрическая цепь 6 Electric circuit 7 Напряжение 7 Положительный и отрицательный заряды 8 1 2 3 8 2 3 LOGO Electric current Direction of electric current Direct and alternating current Voltage Positive and negative charges

Team competition LOGO 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.

Questions: Describe figure on the slide: LOGO

Questions: LOGO v. Electric current is the motion of _______ v. Electric circuit is _____of electricity, _____ and ______ v. Current may be of two types: ______and_______.

Questions: LOGO v. What effects of electric current do you know? v. What are conditions for current existence?

Questions: LOGO v. You have prepared electric source. Tell about it.

Questions: v. Who said the term “electric current” for the first time? André-Marie Ampère (20 January 1775 – 10 June 1836) LOGO

Current - Сила тока (I, A) Current is the amount of charge passing through a point in the circuit in one second. LOGO

Current I - Current (A) q – Charge (C) t – time (s) LOGO

Units of current Caution! 1 A is dangerous for life! LOGO

Ammeter (Амперметр) Ammeter is the device for measuring current LOGO

Example of a TV-set circuit: LOGO

Make a circuit: LOGO Draw a circuit into the exercise-book, Write down I= …

LOGO Practice: 1 Find current in electric bulb , if electric charge of 300 C travels through it during 10 min. 2 What charge will travel during 3 min through ammeter if current is 0. 2 A? 3 Current is 200 A. What is the time the charge of 60000 C travels through it? 4 Current in the iron is 0. 2 A. What charge will travel through it during 5 min?

Test on theme “Force of current” #2 #3 Test: #1 #4 #5 LOGO

LOGO Question #1 Current is… a Is the charge travelled through the cross-section area of the conductor during a minute b Is the charge travelled through the cross-section area of the conductor during a second c Is thermal motion of electrons

LOGO Question #2 Ammeter is… a Device for measuring charge b Device for measuring number of electrons c Device for measuring force of current

LOGO Question #3 What circuit is correct? a b A c A A

LOGO Question #4 A charge of 3. 6*104 C passes through a bulb in 1 hour. What is the current passing through the bulb? a b c 10 A 3. 6 A 7. 2 A

LOGO Question #5 An amount of 1020 electrons pass through the cross section of a wire in 8 s. What current is passing through the wire? (take e=1. 6*10 -19 C) a b c 16 A 4 A 2 A

LOGO Diagram 2 c 1 b 5 - “ 5” 4 - “ 4” 3 c 3 – “ 3” 2 – “ 2” 4 a 5 c What is your mark?

Home work: § 36 p. 52 Questions 1 -4(or), #5 (wr) LOGO

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