ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 1
FIGURE 52. VOLTAGE WAVEFORMS.
The fundamental theories concerning simple magnets and magnetism
were covered earlier in this task (pages 2 through 40), but how
magnetism can be used to produce electricity was only briefly
mentioned. The following paragraphs will give a more indepth
study of magnetism. The main points that will be explained are
how magnetism is affected by an electric current and,
conversely, how electricity is affected by magnetism. This
general subject area is most often referred to as
ELECTROMAGNETISM. To become proficient in the electrical field,
the student must first become familiar with the relationship
between magnetism and electricity. For example, he must know
that:
(1) An electric current always produces some form of
magnetism.
(2) The most commonly used means for producing or using
electricity involves magnetism.
(3) The peculiar behavior of electricity under certain
conditions is caused by magnetic influences.
e. Magnetic Fields. In 1819, Hans Christian Oersted, a Danish
physicist, found that a definite
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