Exam 1 Review(2).pdf - Exam#1 Review EEE 202 Circuits I Fall 2018 Our Toolbox Power Equations dq I =(Amps dt Electric power is the rate at which

Exam 1 Review(2).pdf - Exam#1 Review EEE 202 Circuits I...

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Exam #1 Review EEE 202: Circuits I Fall 2018
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Our Toolbox
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Power Equations I = dq dt ( Amps ) V = dw dq ( Volts ) P = dw dt = dq dt × dw dq = IV ( Watts ) Electric power is the rate at which electric energy is transferred by a circuit P IV = The utilities generate electrical power, but sell us electrical energy (measured in kW-h – the kilowatt-hour) *** Understand how the different variables relate to each other and know who to plot each ***
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Passive sign convention: Current should enter the positive voltage terminal P=IV à positive power (+): the element absorbs power à negative power (-): the element supplies power Power Convention
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Ohm’s Law The current through a conductor between two points is directly proportional to the potential difference ( voltage ) across them and inversely proportional to the resistance between them . V I R = V IR = OR The Rest of the Circuit R i + v
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Kirchhoff's Current Law (KCL): The sum of current entering a node is equal to the sum of current leaving a node, Or the algebraic sum of all currents entering a node is zero (entering is +, leaving is -) Conservation of Charge I = I 1 + I 2 = 3 + 1.5 = 4.5 A I j = 0 j = 1 n
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Kirchhoff's Voltage Law (KVL) : The sum of all the elements and source voltages around a closed path is zero. Note: A voltage encountered – to + is positive. A voltage encountered + to – is negative .
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