It adds resistant to a circuit... It measures voltages 7.a : It’s known as a variable capacitor.. It breaks a circuit 9.d : It’s known as ammeter.. It measures very small currents 10.i :
Trang 1NHÓM 2 – LỚP Đ8-ĐTVT 2
MEMBER:
- Phạm Văn Thành
- Phạm Thị Bích Lụa
- Vũ Thị Ngát
- Nguyễn Thị Minh Thu
- Dương Thị Hồng
- Hoàng Thị Hường
Task 1 :
- 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 2 :
Zinc – carbon cell Nicad cell
Positive electrode Manganese dioxide Nickel
Task 4 :
Zinc – carbon cell Nicad cell Electrolyte The electrolyte is a
solution of ammonium chloride
The electrolyte is potassium hydroxide
resistant about 0.5 ohms
1,2V
Task 6 :
1.c : It’s called a resistor It adds resistant to a circuit
Trang 22.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 8 :
1 Oscillator
2 Transmitter
3 Transfomer
4 Charger
5 Rectifier
6 Processor
7 Amplifier
8 Collector
9 Detector
10.Tuner
Task 9 :
- Fuse
- Neon lamp
- Transfomer
- Four diodes
- Electrolytic capacitor
- Zener diode
- Bipolar transistor NPN
Task 10 :
Trang 31 a
2 h
3 d
4 f
5 g
6 c
7 e
8 b
Task 11 :
1 the function is recharged to their original voltage and can be used many times over
2. - The transformer consist of a transfomer , a neon lamp , a double-pole 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
3. - 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
4 - 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