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Lecture04 - Chapter 2

# Lecture04 - Chapter 2 - EE216 C ircuit Analysis I Le cture...

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1 EE216 Circuit Analysis I Lecture # 4 – Chapter 2

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2 Summary (1/2) Current = rateof chargeflow i = dq/dt Voltage = energy per unit charge created by chargeseparation v = dw/dq Power = energy per unit time p = dw/dt = v x i Ideal Basic Circuit Elements 1. two-terminal component 2. that cannot be sub-divided 3. described mathematically in terms of its terminal voltage and current
3 Summary (2/2 ) Ideal Basic Circuit Elements An ideal voltage source maintains a prescribed voltage regardless of the current in thedevice. An ideal current source maintains a prescribed current regardless of the voltageacross the device. A resistor constrains its voltageand current to be proportional to each other: v = iR (Ohm 's law) Passive sign convention For a passivedevice, thereferencedirection for current through theelement is in the direction of thereferencevoltagedrop across the element

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4 Electrical Resistance (1/2) Current flows through a medium known as a conductor . Copper is considered to be a good conductor as it has a valency of +1 Application of an electrical field across two ends of a Copper wire allows thesingleelectron in theouter most shell of Copper atoms to move towards the positiveelectric field Carbon is considered to bea bad conductor as a greater amount of work must bedone to allow valenceelectrons to movetowards the positivefield.
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