Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Composition of DC Circuit of Node Current Lawserver rack China

Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Resistance and Resistance Law

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1.2.3 Kirchhoff's law

Ohm's law can only solve the relationship between the current, resistance and voltage of a single power source and a series parallel circuit. For a complex circuit with multiple power sources, it needs to rely on Kirchhoff's two laws to analyze and deal with it.Intelligent micro module data room server rack network rack network cabinet wall mounted cabinet open rack rack accessories rack tray blank plate gasket wire mesh cable tray basket cable tray perforated cable tray cable ladder PDU
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1.2.3.1 Kirchhoff's first law (nodal current law)

Each branch of a circuit that passes through the same current is called a branch. The connection points of three or more branches are called nodes. In Figure 1.2-3, there are three branches. The current of each branch is I1, I2 and I3, respectively. There are two nodes, C and D.

Kirchhoff's first law stipulates that the current flowing into the node is equal to the current flowing out of the node, that is, according to the principle of current continuity, there should be no charge accumulation at the node. In Figure 1.2-3, the inflow current of point C is I1, I2, and the outflow current is I3. Therefore, I1 ＋ I2 ＝ I3 can be rewritten as I1 ＋ I2 － I3 ＝ 0 or Σ I＝0。

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It can be seen from the above formula that if the current flowing into the node is specified as "+", the current flowing out of the node is specified as "-"

For any node in the circuit, the algebraic sum of the current flowing into (or out of) the node is equal to zero. This is Kirchhoff's first law.

1.2.3.2 Kirchhoff's second law (loop voltage law)Server Rack Network Rack Network Cabinet Wall mounted Cabinet Open Rack Rack Accessories Rack Tray Blank Plate Gasket Wire Mesh Cable Tray Grid Cable Tray Basket Cable Tray Perforated Cable Tray Cable Ladder subzero cold aisle containment cold aisle containment system hot cold aisle data center cold aisle china containment price hot aisle containment vs cold aisle containment intelligent data center magazine what is intelligent data center  canovate smart server rack  emerson smart server rack server rack network rack Network cabinet wall mounted cabinet Open Racks Frame rack accessories rack tray blank panel spacer

A circuit composed of many branches is called a network, and any closed path in the network is called a loop. In a closed circuit, if it makes a detour in any direction, the algebra of all electromotive forces in the circuit is Σ E must be equal to all electricity in the circuit

Algebraic sum of resistive voltage drop Σ IR, the expression is:Σ E＝ Σ IR or Σ E＝ Σ U The electromotive force and voltage drop that are the same as the bypass direction are specified as positive values, and - 5 the electromotive force and voltage drop that are opposite to the bypass direction are specified as negative values. As shown in Figure 1.2-4, E1 － E2 in loop 1=I1R1 － I2R2, while E1 in loop 2=I1R1 ＋ I3R3.cold aisle containment cold aisle containment system hot cold aisle data center cold aisle china containment price hot aisle containment vs cold aisle containment intelligent data center magazine what is intelligent data center  canovate smart server rack  emerson smart server rack server rack network rack Network cabinet wall mounted cabinet Open Racks Frame rack accessories rack tray blank panel spacer

Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Node Current Law server rack China