Voltage (V): is the energy that electrons get from a generator, this energy expressed in VOLTS. Electric current (I): is the amount of charge or the number of electrons, that flow past a certain point in the circuit every second.This charged is expressed in AMPS (A). Resistance (R): refers to how easily and electric current passes through a certain material or component. We express this quality in OHMS ( ). Electron (-): A stable subatomic particle with a charge of negative electricity . Protom (+): is a subatomic particle found in the nucleus of every atom .Neutron: an elementary particle having no charge.