DC circuit equations and laws

Chapter 1.1 DC circuit equations and laws

Lessons In Electric Circuits Volume V – Reference Book
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Lessons In Electric Circuits Volume V – Reference Book

  • 4CHAPTER 1. USEFUL EQUATIONS AND CONVERSION FACTORS 26,1.11 26,Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 26,1.12 26,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181.1DC circuit equations and laws1.1.1Ohm’s and Joule’s LawsOhm’s LawE = IRI = ERR = EIP = IEP = RE2P = I2RWhere,E = I =R = P = Voltage in voltsCurrent in amperes (amps)Resistance in ohmsPower in wattsJoule’s LawNOTE: the symbol ”V” (”U” in Europe) is sometimes used to represent voltage instead of”E”. In some cases, an author or circuit designer may choose to exclusively use ”V” for voltage,never using the symbol ”E.” Other times the two symbols are used interchangeably, or ”E” isused to represent voltage from a power source while ”V” is used to represent voltage across aload (voltage ”drop”).1.1.2Kirchhoff’s Laws”The algebraic sum of all voltages in a loop must equal zero.”Kirchhoff’s Voltage Law (KVL)”The algebraic sum of all currents entering and exiting a node must equal zero.”Kirchhoff’s Current Law (KCL)