CET ELEC.20 Capacitors

A 500 nF capacitor is connected to a 300 kΩ resistor What is the total charge time of this capacitor?

0.75s

Four capacitors having values of 20 µF, 50µF, 40µF, and 60 µF are connected in parallel What is the total capacitance of this circuit?

170 µF

A 450 pF capacitor has a total charge time of 0.5 s How much resistance is connected in series with the capacitor?

222.222 MΩ

A film-type capacitor is marked 253 H What are the capacitance value and tolerance of this capacitor?

25,000 pF ± 3%

A postage stamp capacitor has the following color marks starting at the upper-left dot: black, orange, orange, black, silver, and white What are the capacitance value and tolerance of this capacitor?

33 pF ± 10 %

A postage stamp mica capacitor has the following color marks starting at the upper left dot: yellow, violet, brown, green, no color, and blue What are the capacitance value, tolerance, and voltage rating of this capacitor?

470 pF ± 5% 600 V

A capacitor uses air as a dielectric and has a capacitance of 3 µF. A dielectric material is inserted between the plates without changing the spacing, and the capacitance becomes 15 µF. What is the dielectric constant of this material?

5

If the four capacitors in Question 5 were to be connected in series, what would be the total capacitance of this circuit? Four capacitors having values of 20 µF, 50µF, 40µF, and 60 µF are connected in parallel What is the total capacitance of this circuit?

8.955 µF

A 22 µF capacitor is connected in series with a 90 kΩ resistor How long will it take this capacitor to charge?

9.9 sec

Explain how an electrolytic capacitor is constructed

By connecting two wet type electrolytic capacitors back to back

What type of electrolytic capacitor will be permanently damaged if connected to the incorrect polarity?

Dry type electrolytic

In what form is the energy of a capacitor stored?

Electrostatic charge

List three factors that determine the capacitance of a capacitor

The area of the plates The distance between the plates The type of dielectric

What is the dielectric?

The insulation between the plates

Can a non-polarized capacitor be connected to a DC circuit?

Yes