ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 1
Earlier it was learned that inductance is the property of a coil
coil. The energy is stored in such a way as to oppose any
change in current. CAPACITANCE is similar to inductance because
it also causes a storage of energy. A CAPACITOR is a device
that stores energy in an ELECTROSTATIC FIELD. The energy is
stored in such a way as to oppose any change in voltage. Just
how capacitance opposes a change in voltage will be explained
later. However, it is first necessary to explain the principles
of an electrostatic field as it is applied to capacitance.
a. The Electrostatic Field. It was previously learned that.
opposite electrical charges attract each other while like
electrical charges repel each other. The reason for this is the
existence of an electrostatic field. Any charged particle is
surrounded by invisible lines of force, called electrostatic
lines of force. These lines of force have some interesting
(1) They are polarized from positive to negative.
(2) They radiate from a charged particle in straight lines and
do not form closed loops.
(3) They have the ability to pass through any known material.
(4) They have the ability to distort the orbits of tightly
Figure 26 on the following page represents two unlike charges
surrounded by their electrostatic field. Because an
electrostatic field is polarized from positive to negative,
arrows are shown radiating away from the positive charge and
toward the negative charge. Stated another way, the field from
the positive charge is pushing, while the field from the
negative charge is pulling. The effect of the field is to push
and pull the unlike charges together.
In figure 27 on the following page, two like charges are shown
with their surrounding electrostatic field. The effect of the
electrostatic field is to push the charges apart.