Each channel of a stereo receiver is capable of an average power output of 100W

Q: Each channel of a stereo receiver is capable of an average power output of 100W

A) As power = voltage^2 / resistance so, RMS voltage = sqrt(P*R) = sqrt(100*9) = 30 volts B) Power = voltage *current RMS current = P / V = 100 / 30 = 3.3 A C)When P = 1W RMS voltage = sqrt(1*9) = 3 V D) RMS current = 1 / 3 = 0.3 A

ID: 1509358 • Letter: E

Question

Each channel of a stereo receiver is capable of an average power output of 100W into an 9-loudspeaker (Figure 1) .

Part B

What is the rms current fed to the speaker at the maximum power of 100W?

Express your answer to one significant figure and include the appropriate units.

Part C

What is the rms voltage fed to the speaker at 1.0W when the volume is turned down

Express your answer to one significant figure and include the appropriate units.

Part D

What is the rms current fed to the speaker at 1.0W when the volume is turned down

Express your answer to one significant figure and include the appropriate units.

Explanation / Answer

A) As power = voltage^2 / resistance

so,

RMS voltage = sqrt(P*R)

= sqrt(100*9)

= 30 volts

B) Power = voltage *current

RMS current = P / V

= 100 / 30

= 3.3 A

C)When P = 1W

RMS voltage = sqrt(1*9)

= 3 V

D) RMS current = 1 / 3

= 0.3 A

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Each channel of a stereo receiver is capable of an average power output of 100W

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