ELECTRICAL ENGINEERING DEFINITIONS: INTRO QUESTIONS AND ANSWERS 100% CORRECT!!!

polarity -ANSWER positive or negative condition at power supply AC: Alternating Current -ANSWER Polarity changes back and forth. When the voltage reverses, so does the direction of the current flow; more efficient over long distance; used in nearly all the world's distribution systems DC: Direct Current -ANSWER current that flows continuously in a single direction and supplies constant voltage. - batteries, phone chargers Static Electricity -ANSWER Excess charge on an objects surface Conductor: -ANSWER anything that allows current to flow, such as copper wire Voltage -ANSWER electrical force that causes electrons to move; energy per unit charge; measured in volts; also called Electromotive Force or potential difference current -ANSWER rate of flow of electrons; measured in amperes; current has direction/polariy conventional current flow -ANSWER current flows from positive to negative Electron Flow Theory -ANSWER electrons move from negative to positive Ground / Common: -ANSWER signifies 0v or direct connection to earth. Provides a reference voltage to a circuit. Passive Component -ANSWER those electrical devices that do not require external power to operate. Examples: resistors, capacitors, inductors Through-hole -ANSWER a component whose pins or leads are inserted through a hole on a PCB in order to be soldered. Potentiometer -ANSWER 3 terminals, used to divide voltage Rheostat -ANSWER 2 terminals, used to control current Active Component -ANSWER requires an independent source of power to operate. Examples: transistors, microchips, LEDs Surface Mount (SMT) -ANSWER A component that lays flat on the surface of a circuit b