Question

Q4. A science project exhibit, a capacitor is connected in series with a bulb connected to an ac
source. If its voltage amplitude is held constant, choose the correct option for the light bulb to
glow the brightest at (a) high frequencies (b) low frequencies (c) The brightness will be same at
all frequencies. At what frequency the light bulb will glow the dimmest, if capacitor is replaced by
inductor? When an AC source is replaced by DC source find out whether the bulb will glow or
not in both cases? Justify your answer scientifically. In the above circuit 4.4 μF capacitor in series
with light bulb of resistance 1.5 kΩ connected to 240 V, 50 Hz? How can you evaluate the r.m.s
value of current through the entire circuit? Can you find the average power developed across
the entire circuit? When the capacitor is replaced by the inductor of 450 mH, how can you predict
the r.m.s current and average power in that circuit? In an LCR series circuit, when capacitive
reactance and inductive reactance are equal then what would be the r.m.s current flowing in the
circuit? Prove this r.m.s current higher than r.m.s current in LR and CR circuits calculated in
above cases? Justify your answer.

Answer 1