Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - DC circuit and calculation depth learning server cabinet

DC circuit and calculation
1.2.1 Composition of DC circuit
The path through which current flows is called a circuit. The circuit is composed of power supply (E), load (R), wire and control protection equipment, as shown in Fig. 1.2-1. Server cabinet Network cabinet Cold channel cabinet Hot channel machine room Data center micro module idc
(1) Power supply
Power supply is a device that continuously converts other forms of energy into electrical energy. For example, the battery is a device that converts chemical energy into electrical energy, and the generator is a device that converts mechanical energy into electrical energy.
The potential difference between the two poles generated by the chemical reaction inside the power supply is called the electromotive force, which is expressed by the symbol E, in volts, and expressed by the symbol V.
(2) Load
Load is the electrical equipment, its role is to convert electrical energy into other forms of energy. For example, electric lamps convert electric energy into heat energy and light energy. In addition to power supply and load, the utility circuit also includes metal conductors, on-off of control circuit, switches, contactors, fuses, relays and other protective devices to prevent circuit overload and short circuit.

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1.2.2 Ohm's law
1.2.2.1 Ohm's Law of Local Circuit Server Cabinet Network Cabinet Cold Channel Cabinet Hot Channel Machine Room Data Center Micromodule idc
The experiment proves that the current I in the circuit is proportional to the voltage U at both ends of the resistance and inversely proportional to the resistance R. This conclusion from the experiment is called Ohm's Law of Local Circuits. The expression is:

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Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center -DC circuit and calculation depth learning server cabinet

I=This equation can also lead to two other formulas:
U=IR deep learning server cabinet network cabinet cold channel cabinet hot channel machine room data center micro module idc
R =Textbook for Operation and Maintenance Engineer of Power and Environment Discipline of Data Center - Basic Knowledge of Circuit - DC Circuit and Calculation Depth Learning Server Cabinet Network Cabinet Cold Channel Cabinet Hot Channel Machine Room Data Center Micromodule idc

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Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center -DC circuit and calculation depth learning server cabinet