Lamina
发表于 2025-3-23 09:49:06
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欢呼
发表于 2025-3-23 17:38:45
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肥料
发表于 2025-3-23 19:50:18
Circuit analysis,’s laws are almost the only ones — but from these a number of theorems have been deduced to assist in circuit analysis. In this chapter we shall primarily be concerned with direct currents and voltages (DC for short), but the principles developed will serve for analysing circuit behaviour with alternating currents and voltages (or AC).
Anticoagulant
发表于 2025-3-24 01:21:52
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Cloudburst
发表于 2025-3-24 04:05:51
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慢慢冲刷
发表于 2025-3-24 08:21:17
Semiconductors, of the periodic table (see table 6.1) and occasionally from groups II and VI. These are known respectively as III-V and II-VI compounds, examples being gallium arsenide (GaAs), gallium phosphide (GaP) and cadmium sulphide (CdS).
枯萎将要
发表于 2025-3-24 10:48:14
Field-effect transistors,ave become reliable and cheap, but also power devices such as HEXFETs and VMOS FETs have replaced many types of power bipolar devices, and semiconductor memories are no more than huge arrays of MOSFETs.
allergen
发表于 2025-3-24 17:37:28
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失眠症
发表于 2025-3-24 19:19:52
Power amplifiers, power supplies and batteries,ly to be bulkier than need be but also more expensive. Power amplifiers are divided into classes according to the duty cycle of the output transistors, that is the proportion of the time they spend in the active parts of their output characteristics; the higher the duty cycle, the lower the efficiency.
Mortal
发表于 2025-3-25 01:31:04
Synchronous machines, electrical machines. They are large, not only because we need vast quantities of electricity, but also because large generators are cheaper per MW to construct and to operate, and are more efficient than small generators. A synchronous generator rated at 1000 MVA should turn more than 98% of the mechanical power input into electrical power.