
4.1 R–L–C SERIES CIRCUIT WITH VARIABLE
FREQUENCY INPUT VOLTAGE
In the previous chapter, we had discussed R–L–C circuits
with a constant frequency voltage source. We will now
consider a series R–L–C circuit with a variable frequency
voltage source, as shown in Figure 4.1.
s
Figure 4.1 Series R–L–C
Circuit
R–L–C Circuits
and Resonance
4
After carefully studying this chapter, you should be able to do the following:
State the condition of resonance in an
R–L–C series circuit.
Explain the effect of variation of fre-
quency of supply voltage on the cur-
rent, power factor, and voltage drops in
an R–L–C series circuit.
Explain how R–L–C series circuit ...