CAIE A-Level Physics 21.1.4 R.M.S. and Peak Values
Practise converting between r.m.s. and peak sinusoidal current or voltage and interpreting r.m.s. power in a resistive load.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- A2
Exam points
- distinguish r.m.s. and peak current or voltage
- calculate r.m.s. or peak values using I_rms=I₀/√2 and V_rms=V₀/√2
- interpret the practical power meaning of r.m.s. values in a resistive load
21.1.4—Root-mean-square (r.m.s.) and peak values and recall and use I r.m.s. = I0 / question 1
[Maximum number: 1]
The output potential difference (p.d.) of an alternating power supply is represented by
V=320sin(100πt)
where V is the p.d. in volts and t is the time in seconds.
Determine the root-mean-square (r.m.s.) p.d. of the power supply.
r.m.s. p.d. =
230 V
A1
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