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Anonymous users2024-02-05There are generally three types of electrician certificates. 1: The electrician qualification certificate (work certificate) issued by the Work Safety Supervision Bureau has two kinds of certificates: high voltage and low voltage.
2: The electrician grade certificate is issued by the Labor Bureau. There are intermediate and advanced levels.
Three: electrician access card. It is issued by the power grid company (formerly the Electric Power Bureau) Note: The electrician certificate of the Safety Supervision Bureau is the most important. He and the power grid company do not recognize each other.
A medical examination is required, but not strict. If you pass the physical examination of the municipal hospital, you will be OK. Fees vary from place to place. The specific time for obtaining the certificate is also different. We have a total of more than 600 points for the qualification. You'll be able to get it in a month.
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Anonymous users2024-02-04There are generally the following types of electrician certificates: 1: ground pressure book 2:
High Voltage Ben 3: Cable Ben 4: Automation Engineer.
Generally, ground pressure and high voltage are divided into two types: intermediate electrician and senior electrician. Generally, there is no physical examination, there is dizziness, color blindness, it is best not to do it, after all, it is very dangerous, 400 yuan is fine, and it is okay to finish the exam for 3 months.
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Anonymous users2024-02-03Physical examination is required, and patients with heart disease, color blindness, and deafness are not allowed to study. According to their own needs, high voltage and low voltage can be combined with low voltage. In the safety supervision bureau for electrician operation certificate, labor bureau for electrician qualification certificate, power supply bureau for network operation permit, general training for about half a month, the examination is very simple, you can generally get the certificate, the price varies from place to place about 400 1000 yuan.
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Anonymous users2024-02-02A power supply can be seen as a series of voltage sources and a power supply internal resistance. Because the open-circuit voltage is 24V, that is, the voltage of this power supply is 24V.
When the power supply is short-circuited, the current is 30A, which means that under the voltage of 24V, the internal resistance of the power supply is 30V when the internal resistance of the power supply is short-circuited, so the internal resistance of the power supply r=u i=24 30=.
When the external resistor is connected, the supply voltage is still 24V, and the loop resistance is the sum of the internal and external resistance, that is, the loop current i=U R=24 2=12A.
The voltage drop across the resistor caused by a 12A current is: U=IR=12*.
Then the current when it is connected to an external resistor is 12A, and the terminal voltage is .
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Anonymous users2024-02-01(1) The capacitance is considered an open circuit at DC steady state.
uc(0_)=20v
The capacitance voltage cannot be abruptly changed.
uc(0+)=uc(0_)=20v
2)ic(0+)=uc(0+)+5]/10=-25/10=
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Anonymous users2024-01-31Solution: Two 2 ohm resistors divide the voltage (in series), so the intermediate potential is 12 2 = 6 volts. And because there is no loop at point A, there is no voltage drop in the 4 ohm resistor, so the potential at point A is also equal to 6V, so D is selected for this question.
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Anonymous users2024-01-30According to the same node voltage, i*1=(i-4)*1+4, i=4a, and the current is 4a.
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Anonymous users2024-01-29Because the vector sum of the currents in the loop is equal (the incoming current is equal to the outgoing current), so.
5a+i=2a
i=2a-5a=-3a
i.e. i flows in the opposite direction to the arrow in the diagram, and the absolute value of the current is 3a.
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Anonymous users2024-01-281） uce = vcc - rc*ic；If you get IC, then IB can be obtained;
2）ib*(rp+rb) +ube = vcc； ube = ；
Then, rp can be obtained;
Okay, do the math yourself;
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Anonymous users2024-01-27When compressing, you will find the files in the whole computer.
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Anonymous users2024-01-26The diagram in the question can be converted into this diagram, uab = iab= so the current on 81 in series with 9 is , the voltage is , then the total voltage of the road is 1v, and the voltage on 10 is 1v and the current is. Current on the first 81 on the left = voltage is 81 * (1 9) = 9v
The voltage of the parallel branch is 1V
So UEF=9+1=10V
1) There is no positive or negative in the line itself.
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Hello, please pay attention to the details.
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Teleportation can only appear in the Panlong totem, they may not appear there, it may be flying, flying can fly at will in this map, and it is possible that he used the city return charm (back to the nearest city), flying is very simple, open the map (not the world) There is a "flight" in the lower right corner Click on him and then click on the map where you want to go, and there will be clouds below you, and you can fly to where you want to go, The second floor is wrong, the mount can only run with the master, and you can also add attributes, there is no flying mount.