Welcome to the Quiz!
This quiz contains 17 questions from a mix of 1 subtopics.
What is the primary characteristic of alternating current (AC)?
it maintains a constant voltage
it has a fixed frequency
it constantly changes direction
it flows in a single direction
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How is a direct current (DC) signal represented on an oscilloscope?
as a series of dots
as a straight horizontal line
as a curved line
as an oscillating line
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Which oscilloscope setting adjusts the scale for volts per vertical division?
Y-gain
X-gain
trigger level
time base
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What does the time period (T) represent on an oscilloscope trace?
the equivalent DC voltage
the duration of one complete waveform cycle
the highest voltage level reached
the total voltage change from peak positive to peak negative
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What is the root mean square (RMS) voltage (Vrms)?
the peak voltage of an AC signal
the total voltage change from peak positive to peak negative
the equivalent DC voltage that would deliver the same power as the AC signal
the duration of one complete waveform cycle
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What is the peak voltage (V0) of the UK mains supply?
650 V
325 V
230 V
50 Hz
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What is the RMS voltage of the UK mains supply?
50 Hz
325 V
230 V
650 V
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What is the peak-to-peak voltage of the UK mains supply?
230 V
50 Hz
325 V
650 V
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What is the supply frequency of the UK mains electricity?
650 Hz
230 Hz
325 Hz
50 Hz
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Describe the role of RMS voltage and current in calculating the power of an alternating signal.
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An alternating current (AC) signal has a peak voltage of 200 V. Calculate the root mean square (RMS) voltage of this AC signal.
V
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If the peak current (I0) in an AC circuit is 5 A, calculate the RMS current (Irms).
A
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A sinusoidal AC signal has a frequency of 50 Hz and a peak voltage of 150 V. What is its RMS voltage?
V
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An oscilloscope displays an alternating current (AC) signal with a peak voltage of 240 V. What is the root mean square (rms) voltage of this signal?
120 V
240 V
170 V
339.41 V
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If the peak-to-peak voltage measured from an oscilloscope trace of an AC signal is 400 V, what is the peak voltage (V0) of this signal?
200 V
300 V
400 V
100 V
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Using an oscilloscope, the time period (T) of a complete waveform cycle of an AC signal is measured as 20 ms. What is the frequency of this AC signal?
500 Hz
50 Hz
1000 Hz
20 Hz
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What is the peak-to-peak voltage for a UK mains electricity supply, knowing its rms voltage is 230 V?
650 V
325 V
920 V
460 V
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