The sinusoidal output of an audio amplifier is displayed on an oscilloscope set to…
PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electromagnetic induction and alternating-current circuits · Electromagnetic induction and alternating-current circuits
Electricity, Magnetism and Electromagnetism, Ch Alternating current: peak and rms values, the oscilloscope and rectification
Problem
The sinusoidal output of an audio amplifier is displayed on an oscilloscope set to 0.50ms per division on the time base and 2.0V per division on the vertical axis. One complete cycle occupies 4.0 horizontal divisions, and the trace runs from trough to crest through a total height of 6.0 divisions. The oscilloscope is ideal and draws no current. The output is connected to a loudspeaker which behaves as a pure resistance of 8.0Ω, constant over the cycle.
((a)) Find the period and the frequency of the output.
((b)) Find the peak voltage and the root-mean-square voltage.
((c)) Find the mean power delivered to the loudspeaker.