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AC unit 10
10 C
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AC circuit analysis
Apply circuit laws and rules in ac analysis
<|>
Use rms values in voltage and current calculations
<|>
Determine the resultant waveform of superimposing ac and dc components
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All
circuit laws
and
rules apply
to
ac
circuits in the same way they apply to
dc
circuits
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For an
ac circuit
,
all ac voltages
and
currents
are in
rms values
unless otherwise specified
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Example 1: Determine the voltage drops across each resistor and the circuit current
1.
Find total resistance RT
2.
Apply Ohm's law to find current I
3.
Voltage drop across R1, V1 = I x R1
4.
Voltage drop across R2, V2 = I x R2
5.
Can also apply VDR to find voltage drops
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Superimposed dc
and ac
voltages
In many
circuit practices
, you will find
both
ac and
dc voltages combined
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Case 1: If
Vdc
> Vp
1.
Vmax
=
Vdc
+
Vp
2.
Vmin
=
Vdc
-
Vp
3.
Sine wave
does not reverse its
polarity
and is
non-alternating
4. A dc
offset
sine wave
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Case
2
: If
Vdc
<
Vp
Sine wave
is
negative
during certain portion of its
lower half-cycle
and is
alternating
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You have
learned
that:
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