A student connected the output from a source of alternating potential difference (p.d.) to a series resistor combination.
She connected an oscilloscope across the 150 Ω resistor as shown.
The trace obtained on the oscilloscope is shown below.
(2)
Peak p.d. across 150 Ω resistor = .......................................................
(3)
r.m.s. value of current = .......................................................
(3)
Power dissipated in circuit = .......................................................
Another student suggested that a voltmeter would be more accurate than using an oscilloscope to determine the magnitude of the p.d.
Comment on this suggestion.
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