A resistive lamp is to be connected across 220 V, 50 Hz supply. Rated voltage and current of lamp is 110 V, 0.55 A. Calculate value of i) resistance , ii) inductance, iii) capacitance , iv) inductance and capacitance to be connected in series with lamp so that lamp work with rated voltage and current in each case. Also draw phasor diagram for each case. In case iv) consider 50 Hz as resonance frequency
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Answer:
Given P=100W,V
rms
=220V,f=50Hz
by P=
R
V
rms
2
or R=
P
V
rms
2
=
100
220
2
=484Ω
(ii) Now I
rms
=
R
V
rms
=
484
220
=0.45A
Explanation:
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