Electricity, Current, Resistance

To sum up this lesson, you first need to know three very important definitions. The first one is voltage— the amount of work each charge performs. The second is current— the number of charges passing a point per second. Finally, the last is resistance— any opposition to the flow of the charge. 

In order for charges to move, we need voltage, or electric potential difference, to move them. A moving charge is called a current, which is measured in amperes, or "amps" for short. There are two kinds of current: direct current and alternating current. Direct current has a one way charge, like your phone, computer, or lightbulb, while alternating current has a two way charge, like what comes out of your wall plug. The photo of my charger is an example of something with direct charge, as it is plugged into the wall. Anyways, hope this straightforward definition of things helped to explain these concepts to you! :)