Lecture_2 - Basic Electric Circuit Concepts Current, Charge...

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1 BME 311 Network Theory John X.J. Zhang, UT Austin 1 Basic Electric Circuit Concepts Current, Charge Examples: If the current in an electrical device is given by, i(t) = 2t + 4 With q(0) = 1.5 C Find the charge flowing through the device. We have, 00 () (0 ) (2 4 ) 1 .5 tt q t i t dt q t dt =+ = + + ∫∫ qt BME 311 Network Theory John X.J. Zhang, UT Austin 2 Beyond “Charge”…“Spintronics” The electron, one of the fundamental particles of nature, carries an electric charge – Charge is responsible for electricity – Charge does data processing But it also processes a second property, called spin – Spin underlies magnetism – Spin does data storage Ambition: process magnetically – “Spintronics” vs. “Electronics” – Advantages: less/no leak current; retain information when power is cut; reconfigured easily.
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2 BME 311 Network Theory John X.J. Zhang, UT Austin 3 Basic Electric Circuit Concepts Basic Quantities: Current The unit of current is the ampere (A). We note that 1 ampere = 1 coulomb/second We normally refer to current as being either direct (dc) or alternating (ac). i(t) i(t) t dc current 0 0.5 1 1.5 2 2.5 3 3.5 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 ac current BME 311 Network Theory John X.J. Zhang, UT Austin 4 Basic Electric Circuit Concepts Basic Quantities : Current
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Lecture_2 - Basic Electric Circuit Concepts Current, Charge...

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