Inductors and Capacitors in DC

A capacitor is a device

• that has only two plates

• that can store an electric charge

• which is similar to an inductor

• with a metal-dielectric

The unit of capacitance is

• the joule

• the volt

• the Henry

• the Farad

The capacitance of a capacitor

• is proportional to the distance between the plates

• is proportional to the cross-sectional area of the plates

• depends on the permeability of the dielectric

• all of the above

For two capacitors in series, the total capacitance is

• $C_1=\frac{C_1+C_2}{C_1\times C_2}$

• $C_T=C_1\times C_2$

• $C_T=C_1\times C_2$

• $C_1=\frac{C_1\times C_2}{C_1+C_2}$

Which of the following statements is TRUE?

• electrolytic capacitors are polarized

• paper capacitors are polarized

• electrolytic capacitors have no dielectric

• Mica capacitors usually have large capacitances

The equivalent capacitance of the figure is

• $3\mu F$

• $8\mu F$

• $48\mu F$

• $16\mu F$

An air capacitor is often used:

• in filter circuits

• as a substitute for paper capacitors

• when a polarized capacitor is required

• in tuning circuits

Capacitors store energy in a (an)__________.

• metal dielectric

• dry cell

• magnetic field

• electric field

...... is just a coil of wire.

• resistor

• inductor

• capacitor

• transistor

Which electronic components can be polarized and non-polarized?

• resistors

• inductors

• capacitors

• transformers