ĐIỆN tử VIỄN THÔNG DTVT2 nhom7 bai3 khotailieu

Nhóm 7: Nguyễn Bá Duy Trần Minh Đức Vũ Văn Chinh Dương Văn Hùng Đỗ Văn Sang Nguyễn Khắc Ngân Task 1.Because it’s handy , you can bring it with your device everywhere 2.There are two kind of batteries : primary cell ( non-rechargeable ) , secondary cell ( rechargeable ) 3.List of the things contain batteries : Mobile phone , radio , flashlight , tape recorder , robot , clock … Task + Task : Zn-C ( Zinc- carbon cell) Ni-cd (Nicad-cell) Type of cell primary secondary Positive electrode Zinc nickel Negative electrode Manganese dioxide cadmium Example of use torches Portable phones electrolyte Ammonium chloride Potassium hydroxide EMF 1.5V 1.2V Task6 : c _ It’s called a resistor It’s adds resistance to a circuit g _ It’s called vary resistor It’s varies the current in a circuit h _ It’s called a transformer It’s steps AC voltages up or down e _ It’s called switch It’s breaks a circuit b _ It’s called a diode It’s rectifies alternating current j _ It’s called a voltmeter It’s measures voltages a _ It’s called a vary capacitor It’s varies capacitance in a circuit f _ It’s called a fuse It’s protects a circuit d _ It’s called a milliammeter It’s measures very small currents 10 i _ It’s called an aerial It’s receives RF signals Task Verb 10 Task 9: Oscillate Transmit Transform Charge Rectify Process Amplify Collect Detect Tune Noun Oscillator Transmitter Transformer Charger Rectifier Processor Amplifier Collector Detector Tuner AC mains Switch Transformer Bridge retifier consist of diodes smoothing circuit consist of large capacitor in parallel with the rectifier stabiling circuit consist ofa transitor biased by two resistor and a zener diode Task 10: 1_a : transformer steps down the AC mains voltage 2_h : double-pole switch switches the charger on and off 3_d : neon lamp shows when the charger is on 4_f : fuse protects the transformer 5_g : rectifier converts the AC voltage to a DC voltage 6_c : aluminium heatsink keeps the diodes from overheating 7_e : smoothing circuit removes the fluctuations in the DC output of the rectifier 8_b : stabilizing circuit prevents the output from 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 double-pole switch , a fuse The rectifier is composed of four diodes which mounted an aluminium heatstick The smoothing circuit consist of a large electrolytic capacitor Transformer is connected to rectifier by the output of a transformer Rectifier is connected to smoothing circuit by the output of a bridge rectifier Smoothing circuit is connected to stabilizing circuit by the output of a largre electrolytic capacitor Transformer : step down the voltage of the AC mains Rectifier : converts the AC voltage to a DC voltage Smoothing circuit : removes the flutuations in the DC output of the rectifier Stabilizing circuit : Prevents the output from changing when the load varies