alleryStart learning →An AC voltage is described as $v(t) = V_m \sin(\omega t)$. $V_m$ is
Athe RMS value
Bthe average value
Cthe PEAK (amplitude) value
Dthe angular frequency
Answer & Solution
Correct answer: C. the PEAK (amplitude) value
1. In $v(t) = V_m \sin(\omega t)$: $V_m$ is the PEAK (or maximum, or amplitude) value the voltage reaches.
2. RMS value (option A): $V_{RMS} = V_m/\sqrt{2}$ for sinusoidal AC.
3. Average over a full cycle (option B): zero for pure AC (positive and negative halves cancel).
4. $\omega$ (option D) is the angular frequency in rad/s.
_Source: Tony Kuphaldt, "Lessons in Electric Circuits — AC", Vol II, Ch 1 (Basic AC theory)._
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