Resistance and Current

Resistance is the opposition to the flow of charge. Without electric potential or voltage, charge (that is, the electrons) will not flow. The energy change is instantaneous, but the change of charge is slower but eventually gets there.


However, thanks to ...Ben Franklin, we say that the positive charges flow...in a sort of system I can only understand that makes him seem right...


A resistor is anything that resists the flow of charge. A lightbulb is a very common example of this.Resistivity is the resistance of an object. It is shown by the equation:    R = (ρ *length of material)/A
It is measured in ohms, with an upside-down horseshoe-looking thing. In a schematic diagram, a resistor is represented by a cluster of sharp points that resemble a heart monitor line. This is a picture of the symbol for resistor. I figured I might as well show it because I already have pictures of my lightbulb in this room up.


Moving on, current is the number of charges that passes a point per second. DC, direct current, has a one way charge. Alternating current, AC,  has a two way charge. Yay for allusions in real life!