Direct Current (DC) flows one way, then the other way, continually reversing direction.
A. 对
B. 错
Alternating Current (AC) always flows in the same direction.
A. 对
B. 错
Amplitude is the minimum voltage reached by the signal.
A. 对
B. 错
Peak-peak voltage is twice the peak voltage (amplitude).
A. 对
B. 错