physics

posted by .

The average power dissipated in a stereo speaker is 54 W. Assuming that the speaker can be treated as a 4.0- resistance, find the peak value of the ac voltage applied to the speaker.

  • physics -

    Is 4.0- supposed to represent 4.0 ohms?

    If so,
    Average power = Vrms^2/R = 54 W
    = 1/2 * peak power
    Vrms^2 = 54*4 = 216 volt^2
    Vrms = 14.7 volt

    Vrms is called the "root mean square" voltage, the usual value cited for alternating currents.

    The peak voltage is sqrt2 times higher than Vrms, or 20.8 V

  • physics -

    still don't understand where the 20.8V comes into it how u get that?

  • physics -

    I multipl1ed 14.7 (the root mean squere voltage, Vrms) by the square root of 2. That results in the peak voltage, for a sine wave variation. A single-pitch sound is a sine wave, and that is what a speaker would receive.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    The average power dissipated in a stereo speaker is 56 W. Assuming that the speaker can be treated as a 4.0- resistance, find the peak value of the ac voltage applied to the speaker.
  2. Language Studies

    Practice One: Speaker 1: Was there a fiddler at the bar last night?
  3. PHYSICS

    A stereo amplifier creates a 3.5 V potential difference across a speaker. To double the power output of the speaker, the amplifier's potential difference must be increased to: A. 7.0 V B. 9.9 V C. 12 V D. 4.9 V
  4. Physics

    In a certain stereo system, each speaker has a resistance of 4 Ω. The system is rated at 60 W in each channel. Each speaker circuit includes a fuse rated at a maximum current of 4 A. Is this system adequately protected against …
  5. english

    change to reported speech speaker a: eih she is coming! speaker s:who?
  6. alGebra

    A constant tone is being applied to a speaker. The voltage across the speaker is 5 volts. The voltage across the speaker is increased to 15 volts in order to increase the sound level. What is the decibel gain, rounded to the nearest …
  7. English 10

    How do you identify the speaker’s purpose?
  8. English 4

    Sonnet 43 is mainly about A. the death of the speaker's beloved. B. the appearance of the speaker's beloved. C. the ways in which the speaker loves her beloved. D. the speaker's religious beliefs. B ?
  9. Spanish

    Where is ese abrigo located with respect to the speaker?
  10. Literature

    Why is the tone of "I, Too" determined? The speaker intends to have equality someday. The speaker hopes to become an American citizen. The speaker dislikes associating with other people. The speaker prefers to eat in the kitchen. I'm

More Similar Questions