BCTC Industrial Maintenance Technology AMTEC Mechatronic Practice Test 2026

For a sine wave, the rms value is the same as the peak value divided by the square root of 2, and the peak-to-peak is twice the peak value. So Vpeak = Vrms × sqrt(2), and Vpp = 2 × Vpeak = 2 × Vrms × sqrt(2).

With Vrms = 120 V, Vpp = 2 × 120 × sqrt(2) ≈ 240 × 1.414 ≈ 339.36 V.

So the peak-to-peak voltage is about 339.36 V.

The other numbers don’t fit the sine relationship: 120 V would be the rms value, not the full swing; 240 V would come from doubling Vrms without accounting for the sqrt(2) factor; 678.72 V is a larger miscalculation from applying an incorrect factor.