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 V
Trang 1Thành viên nhóm: Lê Văn Hải
Đỗ Mạnh Cường Phạm Hồng Phái Trần Văn Tuất Nguyễn Văn Đại
Vũ Anh Cường
1. 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 thế
Switch: công tắc
Convert: chuyển đổi
Protect: bảo vệ
Trang 2Task 1: Study this statement
Twenty billion batteries are sold every year
Why do 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 Ni- Cad cell Electrolyte Solution of ammonium chloride Potassium hydroxide EMF 1,5 V 1.2 V
Trang 3Task 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.
1. It’s called a resistance It varies the current in a circuit
2. It’s called a rheostat It adds resistance to a circuit
Trang 43. It’s called a transformer It steps AC voltages up or down.
4. It’s called a interrupter It breaks a circuit
5. It’s called a diode It rectifies alternating current
6. It’s called a voltmeter.It measures voltages
7. It’s called a variable capactor It varies capacitance in a circuit
8. It’s called a fuse It protects a circuit
9. It’s called a ampememeter It measures very small currents
10. 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.
Trang 51. Transformer steps down the AC mains voltage.
2. Double – pole switch switches the charger on and off
3. Neon lamp shows when charger is on
4. Fuse protects the transformer
5. Rectifier converts the AC voltage to a DC voltage
6. Aluminium heatsink keeps diodes from overheating
7. Smoothing circuit removes the fluctuations in the DC output of the rectifier
8. 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
1. What is the function of battery charger?
Convert the AC voltage to DC voltage and supply energy for battery
2. What does it consist of in term of block?
Consist a mains power supply with a DC output slighty than the required battery EMF
3. How are the block connected ?
Connected to approve transformer, rectifier, smoothing circuit, stabilizing, fuse
4. 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