第四週 Chp:4 系統單元的組成元件

power supply

A power supply is a device that supplies electrical energy to one or more electric loads. The term is most commonly applied to devices that convert one form of electrical energy to another, though it may also refer to devices that convert another form of energy (e.g., mechanical, chemical, solar) to electrical energy. A regulated power supply is one that controls the output voltage or current to a specific value; the controlled value is held nearly constant despite variations in either load current or the voltage supplied by the power supply's energy source. 

一個電源是一個或多個電力負荷的設備提供電能。這個詞是最常見的應用轉換成電能的一種形式到另一個設備，但它也可能是指設備轉換成電能的另一種形式的能量（如機械，化工，太陽能）。穩壓電源控制輸出電壓或電流到一個特定的值;舉行，儘管在任何負載電流或電源的能量來源提供的電壓變化控制值幾乎不變。

BUS  

 

In computer architecture, a bus is a subsystem that transfers data between components inside a computer, or between computers.
Early computer buses were literally parallel electrical wires with multiple connections, but the term is now used for any physical arrangement that provides the same logical functionality as a parallel electrical bus. Modern computer buses can use both parallel and bit serial connections, and can be wired in either a multidrop (electrical parallel) or daisy chain topology, or connected by switched hubs, as in the case of USB.

在計算機體系結構，總線是一個子系統，計算機內部組件，或計算機之間的數據傳輸。
早期的計算機總線字面平行與多個連接的電線，但現在任何身體上的安排，提供相同的邏輯功能，作為一個平行的電氣總線使用的術語。可以使用現代計算機總線並行和位串行連接，並可以在任何一個多點（電氣並行）有線或菊花鏈拓撲，或通過交換集線器連接，在USB的情況下。