Alternating Currents
Definitions: Alternating Currents
Exam question
State what is meant by the frequency of an alternating current.
9702/42 · Oct/Nov 2024 · Q8(a)
Model answer
The number of complete cycles per unit time.
Exam question
By reference to heating effect, explain what is meant by the root-mean-square (r.m.s.) value of an alternating current.
9702/42 · May/Jun 2021 · Q10(a)
Model answer
The steady current that produces the same average heating power in the same resistor as the alternating current.
Exam question
State, by reference to the power dissipated in a resistor, what is meant by the root-mean-square (r.m.s.) value of an alternating voltage.
9702/41 · Oct/Nov 2021 · Q9(a)
Model answer
The constant voltage that dissipates the same average power in the same resistor as the alternating voltage.
Exam question
State what is meant by rectification.
9702/41 · May/Jun 2025 · Q6(a)(i)
Model answer
The conversion of alternating current to direct current.