Question

1. the ac square wave differs from a dc square wave because

a ac square waves are a higher voltage

b dc square waves have alternating half cycles

c ac square waves have positive and negative half cycles

d ac square waves have a more symmetrical positive half cycle

Explanation:

AC (alternating - current) implies that the current or voltage periodically reverses direction. So, AC square waves have positive and negative half - cycles. DC (direct - current) has a constant polarity and does not alternate.

Answer:

C. AC square waves have positive and negative half cycles