PHYS -Intro to Oscilloscopes question.?
An Oscilloscope shows that a car stereo amplifier can produce 28 vpp sine wave when connected to a 4 ohm speakers. Calculate the power rating per channel in watts (rms).
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Verified answer
28Vpp = 14Vp = 9.9Vrms
I = U / R <=> I = 9.9 / 4 <=> I = 2.475A (ohm's law)
P = U * I <=> P = 9.9 * 2.475 <=> P = 24,5Wrms (power fraction)
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