Alternating Current
Study Guide for Chapter 32
Oscillations
Alternating current involves current that
oscillates
over time.
We usually the following formula for
oscillations:
max
max
one period
C
>
max
cos
Here
is the
, and
is the
of the oscillation.
Angular frequency has
max
amplitude
angular frequency
units of radians per second.
frequency
The
is the number of oscillations (or periods) per unit time.
It is related to the angular
frequency by the formula
Frequency has units of number per second, or
( Hz
sec).
Hertz
Sometimes oscillations occur
, meaning that the first period does not quite start at
.
out of phase
The formula for outofphase oscillations is
max
max
phase
shift
C
>
max
cos
where
is the
.
phase shift
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13. Basic AC Circuits
An
is a power supply whose emf varies sinusoidally over time.
The emf
of
alternating source
an alternating source obeys the equation
max
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 Spring '10
 Turner
 Alternating Current, Hertz, Inductor, LC circuit

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