...
The electrical energy that can actually cause injury is due
to electrical current and how it flows through the body. Why,
then,
does the sign warn of high voltage? Because of the way
electrical ... under-
standing of electrical engineering.
Before we can examine this aspect of electrical safety, we
have to learn how voltages and currents are produced and the
relationship between them....
... Perspective
Electrical Safety
At the beginning of this chapter, we said that current through the body can
cause injury. Let's examine this aspect of electrical safety.
You might think that electrical ... level is not the sole
RSPECWE
determinant of potential injury due to electrical
shock, consider the case of a static electricity shock
mentioned in the Practical Perspective at t...
...
After introducing the techniques for analyzing the natural and step
responses of first-order circuits, we discuss some special cases of interest.
The first is that of sequential switching, ... that
is,
we have a natural-response problem.
RL and RC circuits are also known as first-order circuits,
because their voltages and currents are described by first-order
differential equation...
... e'
2!/T
\
t > 0. (7.18)
The time constant is an important parameter for first-order
circuits,
so
mentioning several of its characteristics is worthwhile. First, it is conven-
ient
... energy-
storage elements in the circuit: the inductor and the capacitor. (A mechan-
ical analogy of this electric circuit is that of a mass suspended on a spring,
where oscillation is possible because ... col
remains at 10
8
rad
2
/s
2
,
Si = -8000 + /6000 rad/s,
s
2
= -8000 - /6000 rad/s.
(In electrical engineering, the imaginary number
V—T is represented by the letter
/",
b...
... of this example, it is important to point out that safety analysis is an
essential part of an electrical engineer's work.
Now that we have modeled the controls for the hair dryer, let's ...
Recall from Chapter 4 that certain systems—for example, those that trans-
mit information via electric signals—depend on being able to transfer a
maximum amount of power from the source to
... Distribution
of
Electric Power
In this chapter we introduce circuits that are designed to
handle large blocks of electric power. These are the circuits
that are used to transport electric power ... considering only balanced circuits.
The analysis of unbalanced three-phase circuits, which you will
encounter if you study electric power in later courses, relies heav-
ily on an u...