Dongguan 2016 Nancheng Electrical Circuit Breaker teaches you how to use the training

domain, at this time, the gate-source level is equivalent to a variable resistor, which gradually increases as it increases from zero. The channel resistance also changes with the change, so it is called a variable resistance area. The pinch-off area is also called the cut-off area, which is equivalent to the cut-off area of the triode. At this time, the channel of the field effect transistor is pinched off, the channel resistance is very large, and the channel current is almost . The constant current area is also called the linear amplification area, which is equivalent to the amplification area of the transistor. At this time, the curve is almost parallel to the horizontal axis, and the size only changes with the change of , and has nothing to do with it, showing the amplification effect of the field effect tube voltage control current.
Contact
Teacher Li
Consultation phone number
br/>School name
Dongguan Guangyou Vocational Training School
Place
Addressed on the third floor of Dongguan Bus Terminal East Station (Guangyou Education)
Guangyou Vocational School is open all year round
,
Learn electrician and provide electrician exam practice software
Guangyou Education
Training objectives
Start from zero basics, guide students in all aspects, how to connect indoor and outdoor wires, emergency first aid and treatment of electric shock, electrician field operation and theory, safe operation, on-the-job operation and employment experience practice< br/> Introduction to specific electrician training courses
Introduction to junior electrician training courses
Safe operation of electricians
Basic knowledge of electrical circuits
Calculation of circuits
Series and parallel connections of resistors and applications
AC, DC
Single-phase AC, three-phase AC
Transformers, mutual inductors
Single-phase meters, three-phase meters
Electric motors
Electrical instruments The use of
Multimeter
Megohmmeter
Current clamp meter
Ammeter
Voltmeter
Application of low voltage electrical appliances
Fuse
Knife switch
Circuit breaker
Contactor
Thermal relay
Intermediate relay
Time relay
Button
Lighting circuit practical operation
Industrial power circuit practical operation
Motor forward rotation control
Motor interlocking forward and reverse rotation control circuit
Double interlocking forward and reverse rotation control circuit
Workbench automatic reciprocating control circuit
br/>Motor sequential start control circuit
Motor reduced voltage start control circuit
Intermediate electrician training course training content electrical control technology, electrician and electronic basics, maintenance electrician technology, internal and external line electrician
Technology Learning,
Electrical equipment operation,
Transformer and motor operation and maintenance, programmable controller principles and applications,
Electrical
knowledge of electrical measurement, practical operations, etc., advanced training content digital circuit technology , Factory power transformation and distribution technology,
Factory electrical control technology,
Principle and application of programmable controller,
Principle and practical technology of single chip microcomputer,
Rectifier and inverter
Variation technology, frequency converter principle and application technology, practical operation, etc.
It can be seen from the structure of the depletion type that the difference between the depletion type field effect transistor and the enhancement type field effect transistor is that the depletion type field effect tube has When there is no gate-source voltage, a conductive channel has been formed using a certain process during manufacturing. Therefore, the gate-source voltage of a depletion mode field effect transistor can be positive or negative. At that time, because there was a channel that produced a drain current under the action of the drain-source voltage, this current was still called the saturation leakage current, which was expressed as when >, the channel became wider, and when the drain current increased, when <, the channel became Narrow, the drain current becomes smaller, and as the reverse voltage increases, the channel becomes narrower and narrower. When it decreases to a certain value, the channel is completely pinched off