求答案， 要有翻译个解说1. The algebraic sum of the ______entering any n

求答案， 要有翻译个解说
1. The algebraic sum of the ______entering any node is zero.
A. current B. reactance C. voltage
2. Electrons, as one knows, are minute _______ charge of electricity.
A. negative B. positive C. reverse
3. The switch, resistor and wire ________ a circuit.
A. constitute B. are composed C. made of
4. A resistor is an electrical component that ________ the flow of electrical current.
A. increases B. resists C. changes
5. “The current is directly proportional to the voltages across it.” These can be described by formula ________ .
A. i=u/R B. p=ui C. i=q/t
6. The electromotive force can do work on charge. Here the underlined means ________ .
A. 功 B. 工作 C. 著作
7. The conductivity of semiconductors is ______ than that of insulator but ________ than that of conductors.
A. higher….lower B. lower…higher C. lower…lower
8. A semiconductor of N-type means that the pure materials have been added impurities with ___________ outer electrons.
A. five B. four C. three
9. An electronic device often used for amplifying voltage and current is _____________.
A. transistor B. conductor C. Diode
10. In a diode, current flows in ________ direction across the junction from the p- to n-type material.
A. only one B. two C. three
11. A _________ amplifier provides signal amplification with little or no distortion, so that the output is proportional to the input.
A. nonlinear B. linear C. electronic
12. In a transistor amplifier, only when the BE junction is _________ bias, and the BC junction is ____________, can the base current iB control the collector current iC.
A. forward…reverse B. reverse…forward C.forward…zero
13. A bipolar junction transistor in the common-emitter mode can act as a ________ amplifier if the transistor has proper bias and a suitable load is connected in the collector circuit.
A.resistance B. current C.voltage
14. All integrated circuit are made from _______ .
A. conductors B. semiconductors C.insulators
15. Low cost and _______ power dissipation can be achieved with IC technology.
A. high B. low C. normal
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1.任何节存在对______entering的代数的总和作归零校正的.A.当前B.电抗C.电压 2.是一知识电子是细微的_______管理电的责任.A.负B.肯定C.挫折 3.开关,电阻器和电报________一环路.A.指定为公亩平静C.使B.成为的 4.一电阻器是一电气成分那________串电气潮流.A.增加B.抵抗C.改变 5.直接和跨过it.”这些能是的电压成比例“The当前存在...

1年前他留下的回答

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