Cambridge AS & A Level Physics
21.1Characteristics of alternating currents
Characteristics of alternating currents in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic21 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 21.1.1Use period, frequency and peak value for alternating currents and voltages.
- 21.1.2Use x = x₀ sin ωt for a sinusoidal current or voltage.
- 21.1.3Recall that mean power in a resistive load is half the peak power for sinusoidal a.c.
- 21.1.4Distinguish r.m.s. and peak values and use the √2 relationships.
Lessons
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Alternating current: period, peak and r.m.s. values
40 min
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Sample question
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Turn Characteristics of alternating currents into a strength.
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