How long does it take to apply for the electrician IC certificate in Dalang, Dongguan in 2016? Are there good training institutions?

The value of the insulation resistance of a capacitor is equal to the ratio of the voltage across the capacitor to the leakage current through the capacitor. The insulation resistance of the capacitor is related to the dielectric material and area of the capacitor, the material and length of the lead, the manufacturing process, temperature and humidity and other factors. For capacitors of the same medium, the greater the capacitance, the smaller the insulation resistance. Ideally, the insulation resistance of the capacitor should be infinite. In actual situations, the insulation resistance of the capacitor is generally between
~
. The size and change of capacitor insulation resistance will affect the working performance of electronic equipment. For general electronic equipment, the larger the insulation resistance, the better. As the insulation resistance becomes smaller, the leakage current increases and the loss also increases
Contact

Teacher Li
Consultation phone number
br/>School name
Dongguan Guangyou Vocational Training School
Location
Address: Third Floor, Dongguan Bus Terminal East Station (Guangyou Education)
Guangyou Vocational School is open all year round
,
Learn electrician and send electrician exam practice software
Guangyou Education
Training goals
Start from scratch, guide students in all aspects, how to connect indoor and outdoor wires, emergency first aid and treatment of electric shock, electrician on-site Combination of operation and theory, safe operation, on-the-job operation and employment experience practice
Introduction to specific electrician training courses
Introduction to junior electrician training courses
Safe operation of electricians
Basic knowledge of electrical circuits< br/>Calculation of circuits
Serial, parallel and application of resistors
Alternating current, direct current
Single-phase alternating current, three-phase alternating current
Transformers, mutual inductors
Single-phase electricity meters , Three-phase ammeter
Motor
Use of electrical instruments
Multimeter
Megohmmeter
Current clamp meter
Ammeter
Voltmeter
Applications of low-voltage electrical appliances
Fuses
Knife switches
Circuit breakers
Contactors
Thermal relays
Intermediate relays
Time relays< br/>Button
Practical operation of lighting circuit
Practical operation of industrial power circuit
Motor forward control
Motor interlocking forward and reverse control circuit
Double interlocking forward and reverse control circuit Reverse control circuit
Workbench automatic reciprocating control circuit
Motor sequential start control circuit
Motor voltage starting control circuit
Intermediate electrician training course training content electrical control technology, electricians and electronics Basics, Maintenance Electrical Technology, Internal and External Line Electrical Technology,
Electrical Equipment Operation,
Transformer and Motor Operation and Maintenance Principles and Applications of Programmable Controllers,
Electricity
Gas measurement knowledge, practical operations, etc., advanced training content digital circuit technology, factory power transformation and distribution technology, factory electrical control technology,
programmable controller principle and application,
single chip microcomputer principle and practical technology,
rectification and inverter
technology, inverter principle and application technology, practical operation, etc.
Frequency characteristics refer to the performance of capacitors at various frequencies (i.e. The characteristic that electrical parameters such as capacitance change with changes in the operating frequency of the circuit). Capacitors with different dielectric materials have different maximum operating frequencies. For example, capacitors with larger capacities (such as electrolytic capacitors) can only work normally in low-frequency circuits, while only high-frequency porcelain dielectrics with smaller capacities can be used in high-frequency circuits. capacitor or mica capacitor, etc. In addition to capacitors, the capacitance due to the distribution characteristics of the circuit is called distributed capacitance. Distributed capacitance is often invisible. For example, there is a certain amount of capacitance between two adjacent turns of a coil, between two discrete components, between two adjacent wires, and between various parts within a component. capacitance. Its impact on the circuit is equivalent to connecting a capacitor in parallel to the circuit, and this capacitance value is the distributed capacitance. In low-frequency AC circuits, the capacitive reactance of distributed capacitance is very large and has little impact on the circuit. Therefore, in low-frequency AC circuits, distribution generally does not need to be considered