Alternating CurrentHard
Question
An AC voltage source of variable angular frequency ω and fixed amplitude V0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ωis increased
Options
A.the bulb glows dimmer
B.the bulb glows brighter
C.total impedance of the circuit is unchanged
D.total impedance of the circuit increases
Solution
Impedance Z = 
as ω increases, Z decreases.
Hence bulb will glow brighter
as ω increases, Z decreases.
Hence bulb will glow brighter
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