选择正确答案（单选）：
1. The symbol for a resistor is: （戳蓝字）
2. The unit for measuring resistance is:
A. V
B. A
C. Ω
3. “120kΩ” means:
A. 120 thousand
B. 120 million
C. 120 hundred
4. “1.2MΩ” means:
A. 12 thousand
B. 1.2 million
C. 120 hundred
5. If the voltage across an 820Ω resistor is 24V, the wattage dissipated by the resistor is:
A. 176mW
B. 702mW
C. 29mW
6. If UB=9V, for the dissipation of a 220Ω resistor, what wattage should be used?
A. 0.125W
B. 0.25W
C. 0.5W
7. If UB=9V, for the dissipation of a 100Ω resistor, what wattage resistor should be used?
A. 0.5W
B. 1W
C. 2W
8. SMD means:
A. 印制电路板
B. 表面贴装器件
C. 四色环电阻
9. “额定功率”in English is:
A. Current rating
B. Wattage rating
C. Voltage rating
10. If the flow of current through a resistor increases, it
A. heats up
B. cools down
C. keeps unchanged
11. What component allows an electric current to pass in one direction and to block the current in the opposite direction?
A. Resistor
B. Capacitor
C. Diode
12. What component is used to create specified values of the current and voltage in a circuit?
A. Resistor
B. Capacitor
C. Diode
13. The symbol for a diode is:
14. The symbol for a LED is:
15. Rectifiers are usually constructed from:
A. Transistors
B. Resistors
C. Diodes
16. Device converting AC into DC is called:
A. Inverter
B. Rectifier
C. Transformer
17. To de-energize coils rapidly in relay circuits without damaging voltage spikes that would otherwise occur, we use:
A. Capacitor
B. Diode
C. Transistor
18. “Flyback diode” in Chinese is:
A. 续流二极管
B. 灭弧器
C. 稳压二极管
19. The current-voltage curve is:
A. Linear
B. Non-linear
C. Exponential
20. “滤波器” in English is:
A. Commutator
B. Rectifier
C. Filter
21. In electronics, a transistor is a semiconductor device commonly used to:
A. allow an electric current to pass in one direction and to block the current in the opposite direction
B. create specified values of the current and voltage in a circuit
C. amplify or switch electronic signals
22. Which device has three terminals for connections to an external circuit?
A. Diode
B. Capacitor
C. Transistor
23. Which device is commonly used as electronic switches?
A. Diode
B. Transistor
C. Capacitor
24. Transistors can be:
A. Amplifier
B. Rectifier
C. Breaker
25. “散热片”in English is:
A. Sink heat
B. Heat sink
C. Hot sink
AC vs DC：100年前两个男人的战争 （英汉对照）
为什么发电厂出来的电是三相，而不是四相或六相？
为什么380V的三相交流电，单相就是220V？
如何看懂电力公司账单？
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