ĐIỆN tử VIỄN THÔNG DTVT2 nhom8 bai3 khotailieu

Thành viên nhóm: Lê Văn Hải Đỗ Mạnh Cường Phạm Hồng Phái Trần Văn Tuất Nguyễn Văn Đại Vũ Anh Cường Vocabulary Battery , cell : pin Primary : nguyên thủy Torcher : đèn pin Portable : di động Reaction : phản ứng Electrode: điện cực Positive : cực dương Negative : cực âm Charging : nạp Varie : thay đổi Rectifies : chỉnh sửa Measure : đo Break : ngắt Protect : bảo vệ Receives : nhận Circuit : mạch Current : dòng điện Stabilizing circuit: ổn định mạch Smoothing circuit: lọc mạch Fuse: cầu chì Rectifier: máy chỉnh lưu Aluminium heatsink: nhôm tản nhiệt Transformer: máy biến Switch: công tắc Convert: chuyển đổi Protect: bảo vệ Task 1: Study this statement Twenty billion batteries are sold every year Why think this is so ? – Because electronic use battery List some of the things you use which contain batteries: Telephone, computer, radio… Task 2: Try to complete this table of differences between to kind of cells Type of cell Zn-C cell Ni-Cad cell Positive electrode Zinc Nikel Negative electrode Cacbon Cadmium Example of use Torches, secondary Portable phone Task 4: Now read text Note and futher information about these cells Zn- C cell Electrolyte EMF Solution of ammonium chloride 1,5 V Ni- Cad cell Potassium hydroxide 1.2 V Task 5: Label this diagram of a Zinc- cacbon cell with these term More than one term can refer to the same part of diagram ( Zn – C cell Coure : internet) Task 6: Here are some circuit symbols Label and describe their function For example It’s called a resistance It varies the current in a circuit It’s called a rheostat It adds resistance to a circuit 3 10 It’s called a transformer It steps AC voltages up or down It’s called a interrupter It breaks a circuit It’s called a diode It rectifies alternating current It’s called a voltmeter.It measures voltages It’s called a variable capactor It varies capacitance in a circuit It’s called a fuse It protects a circuit It’s called a ampememeter It measures very small currents It’s called a aerial It reaceives RF signals Task 8: Each of these verb has a related noun ending or- er which refer to an instrustion or component Verb Noun oscillate oscillator transmit transmitor transform transformer charge charger rectify rectifier process processer amplify amplifier collect collecter detect detector tune tuner Task 10: Match each component or unit with its function in a battery charger 1 Transformer steps down the AC mains voltage Double – pole switch switches the charger on and off Neon lamp shows when charger is on Fuse protects the transformer Rectifier converts the AC voltage to a DC voltage Aluminium heatsink keeps diodes from overheating Smoothing circuit removes the fluctuations in the DC output of the rectifier Stabilizing circuit prevents the output from changing when the load varies Task 11: Describe the block diagram of the battery charger and the function of each building block Your description should answer these question What is the function of battery charger? Convert the AC voltage to DC voltage and supply energy for battery What does it consist of in term of block? Consist a mains power supply with a DC output slighty than the required battery EMF How are the block connected ? Connected to approve transformer, rectifier, smoothing circuit, stabilizing, fuse What is the function of each block? The function of transformer : steps down the AC mains voltage The function of rectifier : converts AC voltage to DC voltage The function of fuse: protects the circuit The function of smoothing circuit: removes the fluctuations in the DC output of the rectifer The function of stabilizing circuit : prevents the output from changing when the load varies