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CAIE A-Level Physics 21.1.1 Period, Frequency and Peak Value

Practise defining and reading period, frequency and peak value for alternating current or voltage from sinusoidal graphs, equations or data.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • define and interpret period, frequency and peak value for alternating current or voltage
  • read sinusoidal graphs or data to determine period, frequency and peak value

21.1.1—The terms period, frequency and peak value as applied to an alternating question 1

[Maximum number: 1]

A bridge rectifier contains four diodes. The output of the rectifier is connected to a resistor R, as shown in Fig. 10.1.

Fig. 10.1

Fig. 10.1

The variation with time t of the input e.m.f. E to the rectifier is given by the expression

E=15cos⁡(210t)E=15 \cos (210 t)

where t is measured in seconds and E in volts.
The variation with time t of the potential difference V across resistor R is shown in Fig. 10.2.

Fig. 10.2

Fig. 10.2

Determine:

the maximum potential difference VMAX V_{\text {MAX }} across resistor R

VMAX⁡=V_{\operatorname{MAX}}=
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