Uses of an Oscilloscope

Determine the potential difference (p.d.) across the $700\ \Omega$ resistor.

p.d. = ______

The intensity of the light incident on the LDR gradually increases.

State and explain how the trace on the oscilloscope screen moves.

Using Fig. 7.2, determine the maximum value of the e.m.f. produced by the generator.

maximum e.m.f. = ______ $\text{V}$

Using Fig. 7.2, determine, in milliseconds, the time it takes for one revolution of the coil.

time for one revolution of the coil = ______ $\text{ms}$

Determine the frequency of the output of the generator.

frequency = ______ $\text{Hz}$

Use Fig. 9.1 to determine the maximum voltage of the supply.

voltage = ______

Describe how the trace on the screen and the controls on the c.r.o. are used to measure the time between any two points on the trace.

the maximum voltage,

voltage = ______

the time for one oscillation,

time = ______

the frequency of the sound wave.

frequency = ______

The settings of the c.r.o. remain the same. On Fig. 10.2, sketch the trace of a sound wave with a smaller amplitude and a lower frequency.

On Fig. 7.2, draw a trace representing an alternating output voltage on the screen.

Describe how to use the trace to measure the maximum value of the output voltage.

Calculate the amplitude of the trace shown in Fig. 10.1.

amplitude = ______

Calculate the time for one oscillation (complete wavelength) of the trace shown in Fig. 10.1.

time = ______

On the grid in Fig. 10.3, sketch the trace seen on the screen when the diode is used.

One input terminal of an oscilloscope is connected to the wire at point P, the $0\text{ cm}$ mark of the metre rule.

The other terminal of the oscilloscope is connected to a sliding contact. Initially, this contact touches the wire at point P.

The Y-gain setting on the oscilloscope is $0.20\text{ V / cm}$.

Fig. 10.4 shows the screen of the oscilloscope with a horizontal trace across the middle of the screen.

The sliding contact is slowly moved along the wire until it reaches the other end of the metre rule.

Describe and explain what happens to the trace on the screen.

State and explain the effect on the trace in (c)(iii) of adding the second cell in parallel.