1. is a device that stores energy in
the electric field created between a
pair of conductor on which equal
but opposite electric charge have
been placed.
older term condenser.
CAPACITORS
2. capacitor has two or more
conducting plates segregated from
each other by good insulating
material called dielectric
3. TYPES OF CAPACITOR
1. Electrolytic capacitor is made of
electrolyte, basically conductive
salt in solvent. Leaky condition
can be checked by connecting the
ohmmeter test leads across the
capacitor in one polarity.
4. 2. Ceramics are made with
materials such as titanium acid
barium for dielectric.
Internally, these capacitors are
not constructed as a coil, so they
are suited for use in high
frequency applications.
They are shaped like a disk,
available in very small capacitance
value and very small size.
5. 3. Polyester film (Mylar) uses a thin
polyester film as a dielectric. Not
as high tolerance polypropylene,
but cheap, temperature stable,
readily available, widely used.
6. 4. Mica is an extremely accurate
device with very low leakage
currents. It is constructed with
alternate layers of metal foil and
mica insulation, stacked and
encapsulated.
These capacitors have small
capacitances and are often used in
high frequency circuits (e.g.. : RF
circuits). They are very stable
under variable voltage and
temperature conditions
