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CBSE class 12 Chemistry Syllabus 2024-2025
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Circuit containing Capacitor and resistance in series|Alternating Current
Circuit containing capacitance and resistance in series
Figure below shows a circuit containing capacitor and resistor connected in series through a sinusoidal voltage source of voltage
V=V
_{0}
sin(ωt+φ)
In this case instantaneous P.D across R is
V
_{R}
=IR
and across the capacitor C is
V
_{C}
=I/ωC
In this case V
_{R}
is in phase with current i and V
_{C}
lags behind i by a phase angle 90
_{0}
Figure 11(b) shows the phasors diagram where vector OA represent the resultant of V
_{R}
and V
_{C}
which is the applied Voltage thus
is called the impedance of the circuit
Again from the phasors diagram applied voltage lags behind the current by a phase angle φ given by
tanφ= V
_{C}
/ V
_{R}
=1/ωCR ---(18)
Notes
Alternating current and Alternating EMF
Average or mean current
Root Mean square value of AC
Phasor diagram
A.C through pure resistor
A.C through pure inductor
AC through pure capacitor
Circuit containing inductance and resistance in series
Circuit containing capacitance and resistance in series
LCR series circuit
Assignment
Alternating Current Important Questions for Class 12
Alternating Current Multiple Choice Questions
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