Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Composition of DC Circuit

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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.
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(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.
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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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Textbook for Operation and Maintenance Engineer of Power and Environment Specialty of Data Center - Composition of DC Circuit