The peak value of a sine wave is 200 V. Its average value is

127.4 V
141.4 V
282.8 V
200 V

The correct answer is A. 127.4 V.

The average value of a sine wave is equal to 0.637 times its peak value. This can be calculated using the following formula:

Average value = 0.637 × peak value

In this case, the peak value is 200 V, so the average value is:

Average value = 0.637 × 200 V = 127.4 V

Option B is incorrect because it is the RMS value of a sine wave. The RMS value is equal to 0.707 times the peak value.

Option C is incorrect because it is the peak-to-peak value of a sine wave. The peak-to-peak value is equal to twice the peak value.

Option D is incorrect because it is the peak value of the sine wave.