ĐIỆN tử VIỄN THÔNG DTVT2 nhom2 bai3 khotailieu

NHÓM – LỚP Đ8-ĐTVT MEMBER: - Phạm Văn Thành Phạm Thị Bích Lụa Vũ Thị Ngát Nguyễn Thị Minh Thu Dương Thị Hồng Hoàng Thị Hường Task : - Because it’s handy , you can bring it with your device everywhere - There are two kind of batteries : primary cell ( non-rechargeable ) , secondary cell ( rechargeable ) - List of the things contain batteries : Mobile phone , radio , flashlight , tape recorder , robot , clock … Task : Zinc – carbon cell Nicad cell Type of cell Primary Secondary Positive electrode Manganese dioxide Nickel Negative electrode Zinc Cadmium Example of use Torches Portable phones Zinc – carbon cell Nicad cell Electrolyte The electrolyte is a solution of ammonium chloride The electrolyte is potassium hydroxide EMF 1.5V and internal 1,2V resistant about 0.5 ohms Task : Task : 1.c : It’s called a resistor It adds resistant to a circuit 2.g : It’s called a potentiometer.It varies the current in a circuit 3.h : It’s called a transformer.It steps AC voltage up or down 4.f : It’s called a switch It protect a circuit 5.b : It’ called a diode.It recifies alternating current 6.j : It’s known as a volmeter It measures voltages 7.a : It’s known as a variable capacitor it varies capacitance in a circuit 8.e : It’s called a fuse It breaks a circuit 9.d : It’s known as ammeter It measures very small currents 10.i : It’s known as an aerial It receives RF signal Task : Oscillator Transmitter Transfomer Charger Rectifier Processor Amplifier Collector Detector 10.Tuner Task : - Fuse - Neon lamp - Transfomer - Four diodes - Electrolytic capacitor - Zener diode - Bipolar transistor NPN Task 10 : a h d f g c e b Task 11 : the function is recharged to their original voltage and can be used many times over - The transformer consist of a transfomer , a neon lamp , a doublepole switch , a fuse o The rectifier is composed of four diodes which mounted an aluminium heatstick o The smoothing circuit consist of a large electrolytic capacitor o The stabilizing circuit is composed of a transistor biased by two resistors and a zener diode - Transformer is connected to rectifier by the output of a transformer o Rectifier is connected to smoothing circuit by the output of a bridge rectifier o Smoothing circuit is connected to stabilizing circuit by the output of a largre electrolytic capacitor - Transformer : step down the voltage of the AC mains o Rectifier : converts the AC voltage to a DC voltage o Smoothing circuit : removes the flutuations in the DC output of the rectifier o Stabilizing circuit : Prevents the output from changing when the load varies