# ENGG 225 Lecture Notes - Lecture 3: Electronic Symbol

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Published on 16 Jan 2016
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Ideal Basic Circuit Elements!
Here, we will talk about conductors, sources, resistors. Later, will bring in inductors and capacitors.!
All circuit elements are characterized by their voltage-current relationship!
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Conductors (wires)!
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The absence of a conductor between other circuit elements is an open circuit!
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Sources!
Independent Voltage Sources: !
Symbol:!
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Properties:!
Voltage is speciﬁed explicit - not dependent on any other factor!
Voltage unchanged by whatever it is connected to (voltage independent of the current through it)!
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Dependent Voltage Sources:!
have the same properties as independent voltage sources, except the value of the voltage
depends on either a voltage or current elsewhere in the circuit!
VCVS!
(Voltage-controlled Voltage Source)!
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These can be DC or AC!
A circuit using dependent voltage sources!
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Independent current sources:!
Symbol:!
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Properties:!
current speciﬁed explicitly - not dependent on any other factors!
Current unchanged by whatever it is connected to (i.e., current is independent of the voltage
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