Home
Class 12
PHYSICS
When an ac source is connected to an ide...

When an ac source is connected to an ideal capacitor, show that the average power supplied by the source over a complete cycle is zero.

Text Solution

Verified by Experts

(b) When the lamp is connected to a DC source the lamp will not glow. This is because the capacitor acts as a block for DC . Even on reducing the capacitance of capacitor the lamp will not glow .
When the lamp is connected to an AC source it will glow . But if the capacitance of the capacitor is reduced. Then the brightness of the lamp will also get reduced .
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    MODERN PUBLICATION|Exercise COMPETITION FILE EXEMPLAR PROBLEMS (OBJECTIVE QUESTIONS ) (Multiple choice question (Type ) )|13 Videos

  • ATOMS

    MODERN PUBLICATION|Exercise Chapter Practice Test|16 Videos

Similar Questions

Explore conceptually related problems

(i) When an AC source is connected to an ideal inductor show that the average power supplied by the source ever a complete cycle is zero. (ii) A lamp is connected in series with an inductor and an AC source. What happens to the brightness of the lamp when the key is plugged in and an iron rod is inserted the indcutor ? Explain.

When an a.c source is connected across a resistor

(a) For a given a.c., i = i_(m) sin wt, show that the average power dissipated in a resistor R over a complete cycle is (1)/(2) i._(m)^(2) R . (b) A light bulb is rated at 100 W for a 220 V a.c. supply. Calculate the resistance of the bulb.

A 30 mH pure inductor is connected to 220V, 50 Hz A.C. supply .Net power absorbed by the circuit over a complete cycle is

A 30 mH pure inductor is connected to 220V, 50 HzA.C. supply .Net power absorbed by the circuit over a complete cycle is