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   ocr: WHAT Is ELECTRICITY? a flow ofnegative (Electrons are Exaporhs particles called that electrons. form a part ofall atoms.) These electric charges are measured in units calledcoulombs. Electricity isa very versatile form of energy because it can be converted into many other forms of energy. There are two types ofelectricity: direct current (DC), which flows in one direction only, and alternating current (AC), which changes direction many times every second. Lightning Electricity occurs naturally during some storms, in the form oflightning. SEE ELECTRIC CONDUCTORS ELECTRICITY ALSO CHARGE & INSULA ...