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Capacitors
15 questions By Tony R. Kuphaldt
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Question 1 of 15
Identify some of the different types of capacitors, and their characteristics.
Reveal answerMica, electrolytic, mylar, paper, air, and ceramic are some of the more popular styles.
Notes:There is much to be researched on different capacitor types and characteristics! Encourage your students to research both textbooks and capacitor manufacturer literature for more information.
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Question 2 of 15
How are electrolytic capacitors constructed, and what is particularly noteworthy about their use?
Reveal answer“Electrolytic” capacitors use a very thin layer of metal oxide as the dielectric. The manufacturing process involves applying a DC voltage to the new capacitor to create the oxide layer. This “polarizes” it for life, preventing its use with reverse polarity.
Follow-up question: identify the schematic symbol for any type of polarized capacitor, electrolytics included.
Notes:There are many features of electrolytic capacitors unique to that type, not the least of which being their means of manufacture. Since these capacitors are used so often for low-voltage electronic applications, it is well worth the students’ time to study them well and know their idiosyncrasies.
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Question 3 of 15
A capacitor has a label on it saying, “100 WVDC”. What does this label mean? What is the consequence of exceeding this rating?
Reveal answerThe capacitor’s working voltage is 100 volts DC. Failure of the dielectric material will result from exceeding this voltage rating. In electrolytic capacitors especially, the failure can be violent!
Notes:As with resistors and resistance ratings, there is more to the rating of a capacitor than merely capacitance! Discuss with your students the importance of safety when working with capacitors, not only from shock hazard but also from explosions (resulting from excessive voltage).
