Current is measured in amperes, which is often shortened to “amps”. How does it flow in an electric circuit? Electric charge is that property of matter which determines how strongly that particular bit of matter responds to the presence of other charges. This flow of electrons is referred to as current and is designated by the symbol “I”. Resistor Symbols In this Chapter, we shall We know from basic physics that there are two types of charges: positive (corresponding to a proton), and negative