аний.
Ход урока.
1) Орг. момент. Good afternoon everybody. Im glad to see you. So, lets start our lesson. Today we are going to work with text "Amplifier Stages in Series" and to learn about the Gerund.
2) Работа с текстом по теме Amplifier Stages in Series.
Just now well read about amplifier stages in series, but first lets remember about amplifiers. Answer my questions please.
oo What is an amplifier used for?
oo What are the main parts of a push-pull amplifier?
oo What type of current is amplified by a push-pull amplifier?
oo What is the difference between a rectifier and an amplifier?
So, lets learn about amplifier stages in series.
Look at the new words, write them in your copybooks.
Bias - дополнительное (смещающее) напряжение
Stage - каскад, ступень
To follow - следовать за
Stage of amplification - ступень (каскад) усиления
Grid bias - напряжение смещения
Grid bias battery - сеточная батарея
Grid plate capacitance - ёмкость анодной сетки
Read the text silently and try to get the main idea.
Amplifier Stages in Series.
Amplifiers in use nowadays contain several stages. Sometimes their number is very great. Let us consider an amplifier including three stages. Its circuit uses three triodes connected in series. The circuit has a resistance as the plate load. A common plate voltage supply and a common grid bias are employed. The grid of each tube is insulated from the direct current component of the plate voltage by means of a capacitor. When the amplifier operates the voltage operation of the load of one tube is applied to the grid of the next tube. The voltage variation is transferred to the grid of the following tube through a capacitor. A change of voltag
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