Name:   Shortbus - Subject:   Household electrical voltages Date:   11/2/2016 9:13:21 AM (updated 11/2/2016 10:00:34 AM)

Sixty times a second you have + and - .   It is correct if time is frozen at the right time.

For a split phase system, leg A or phase B might keep the electrician jokes to a minimum.

If you really want to blow your minds, go figure out power factor.

This is where the voltage and current peaks differ in time from each other.

Imaginary current is a real thing.  And impedances are complex.  Power can be apparent.

Curious?  Test for Ham Radio license...............

https://www.qrz.com/hamtest/