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(a) For a given a.c., i = i(m) sin wt, s...

(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.

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MODERN PUBLICATION-ALTERNATING CURRENT -Revision Exercises Short Answer Questions
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  2. Draw the phasor diagram of a series LCR connected across an ac source ...

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  3. (a) For a given a.c., i = i(m) sin wt, show that the average power dis...

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  4. (a) In a series LCR circuit connected across an AC source of varible f...

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  5. What is electric resonance ?

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  6. Write down the condition of resonance in series L-C-R circuit and henc...

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  7. An inductor L of inductance X(L) is connected in series with a bulb B ...

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  8. Answer the following questions : (a) In any a.c. circuit, is the app...

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  9. What is the power dissipation in an AC circuit in which voltage and cu...

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  10. Obtain anexpression for the average power of an a.c circuit .

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  11. What is wattless current ?

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  12. What is power factor of an LCR circuit ? Explain on the basis of power...

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  13. Given below are two electric circuits A and B. Calculate the rat...

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  14. Describe the principle and theory of a transformer . Why the efficienc...

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  15. With the help of a labelled diagram explain the working of a transform...

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  16. Electrical energy is transmitted over large distances at high alternat...

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  17. Why cannot a transformer be used to step up d.c. voltage ?

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  18. The core of a transformer is made of magnetic material of high permean...

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  19. State the principle of an ac generator.

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  20. An a.c. generator having a constant magnetic field is conneted to a re...

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