20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct
current.

Question

Quizplus · Accepted Answer

The RMS value of an alternating current is equal to the peak value divided by the square root of 2. Therefore, the peak value of the alternating current is 20 Vrms * sqrt(2) = 28.28 V. This is greater than the 20 V of direct current, so the alternating current will illuminate the lamp at a higher intensity.

20 Vrms of Alternating Current Will Illuminate a Given Lamp