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EGR 101 Exam #1 Units and Notation Primary Units Secondary Units Scientific Notation Engineering Notation Principles of Electricity Conductors, Insulators, and Semiconductors Charge Coulomb Charge/Time = Current DC Current --- Constant, do not change with time Voltage – Joule/Coulomb Resistance and Conductance Resistivity Determine resistance of a piece of material Resistors Standard Values Tolerance Color Coding Potentiometers Variable Resistor Settings – Define the method Ohm’s Law and Power Relationship between current and voltage V=IR I=V/R R=V/I P=V2/R P=I2R Power P=VI Series Circuits Elements in SERIES have the same current Resistors is Series add together Req=R1+R2+…Rn Voltages around a closed loop add together to equal the source voltage, Sum of all of the voltage drops equals the sum of all the voltage rises Kirhhoff’s Voltage Law (KVL) Conservation of energy Powers add together Voltage Divider – find the voltage across one specific resistor Vn=VS(Rn)/(Req) Ground – Zero Volts – Reference Point Measurement of Voltage, Current, and Resistance DMM on Voltmeter Scales, Ammeter, DMM on Resistance Scales Connected the leads in PARALLEL with the element to measure voltage Connected leads in SERIES with the element to measure current (Break the circuit to insert the ammeter) Measure resistance across the element with one lead disconnected from the rest of the circuit. Series—Opposing and Series—Adding Sources