Cfesa electric Questions With Correct Solutions, Already Passed!!

Voltage - Potential difference or driving force of electrons between two lines Current - Measured in amps. Movement of electrons through a circuit when a difference of potential exists. Direct current (DC) - Circuit electrons flow in only one direction from negative to positive. Frequency - (Hertz) number of times the alternating current changes from 0 to its peak positive then zero to peak negative then back to zero. Power - Amount of energy used. Determined by voltage, current, and resistance in a circuit. Resistance - Impedance or opposition to the flow of current. Measured in Ohms. Every circuit must have resistance. Circuit - a path for an electrical current to flow around Series circuit - An electric circuit with a single path. (Castle wall) Parallel circuit - A circuit that contains more than one path for current flow. (Parachute) Series-Parallel Circuit - Combination of series and parallel circuits. Continuity - Continuous or or unbroken path for current to flow. short circuit - Accidental connection of lower resistance within a circuit.Dead Short - Hot touches ground or two hot lines touch. Safety ground - External path to ground from an enclosure of an electrical device. Used to protect people. DC Power - direct current unbalanced load - Current is not the same on all the lines. Kirchoff's Current Law - The current that goes into a branch is equal to the current that comes out of a branch. What 3 things to know about contactors - Cool voltage line voltage amps