Still crouched beside the table, Peter looks up at Lyanna and smiles. "Hey, you're back." She's probably been back for awhile, he realizes, and he's been too much of an idiot to notice, but at least he's noticing now?

"AC is alternating current," he explains, and pushes himself back to his feet. "Electrical current. It changes direction back and forth, as opposed to DC, which is direct current and only goes the one way. AC is used for the electricity in the houses, like the lights and stuff— Do you know what electricity is?"

In this place, it's so hard to tell, and Lyanna seems really old-timey. Like knights and ladies old-timey.