Electricity

Watch this video (https://www.youtube.com/watch?v=vN9aR2wKv0U) about the diferences between AC and DC power. Then fill the gaps:

In direct current the electrons flow  ___   _________ direction.

In alternating current the electrons _____________.

AC voltage/current is voltage/current that  ________________

DC voltage/current is voltage/current that is  ________________

The AA battery provides _________ volts.

Polarity: ___________ _____________ flows.

AC: the change from start to finish is called _____________

Ohm´s law: whatch this video (https://www.youtube.com/watch?v=iLzfe_HxrWI) and answer these questions:

What is the relationship between voltage, current and resistance?

What are the units of voltage, current and resistance?

What can we appreciate in the current if we increase the number of cells?

What happen with the resistance when we increase the number of cells?