voltage and current sources circuit symbols
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Voltage and Current Sources Circuit Symbols. IDEAL voltage source maintains the prescribed voltage across its terminals regardless of the current drawn from it. IDEAL current source maintains the prescribed current through its terminals regardless of the voltage across those terminals.

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Presentation Transcript
ideal or independent sources
IDEAL voltage source

maintains the prescribed voltage across its terminals regardless of the current drawn from it

IDEAL current source

maintains the prescribed current through its terminals regardless of the voltage across those terminals

“IDEAL” or “Independent” Sources

ECE 201 Circuit Theory I

controlled or dependent sources
“Controlled” or “Dependent” Sources
  • A voltage or current source whose value “depends” on the value of voltage or current elsewhere in the circuit
  • Use a diamond-shaped symbol

ECE 201 Circuit Theory I

voltage controlled voltage source vcvs
Voltage-Controlled Voltage Source VCVS
  • Vs is the “output” voltage
  • Vx is the “reference” voltage
  • u is the “multiplier”
  • Vs = uVx

ECE 201 Circuit Theory I

current controlled voltage source ccvs
Current-Controlled Voltage Source CCVS
  • Vs is the “output” voltage
  • Ix is the “reference” current
  • p is the multiplier
  • Vs = pIx

ECE 201 Circuit Theory I

voltage controlled current source vccs
Voltage-Controlled Current Source VCCS
  • Is is the “output” current
  • Vx is the “reference” voltage
  • a is the multiplier
  • Is = aIx

ECE 201 Circuit Theory I

current controlled current source cccs
Current-Controlled Current Source CCCS
  • Is is the “output” current
  • Ix is the “reference” current
  • b is the multiplier
  • Is = bIx

ECE 201 Circuit Theory I

common emitter transistor amplifier
Common-Emitter Transistor Amplifier

ECE 201 Circuit Theory I

active and passive elements
Active element

a device capable of generating electrical energy

Voltage source

Current source

Power source

Batteries

Generators

a device that needs to be powered (biased)

transistor

Passive element

a device that absorbs electrical energy

Resistor

Capacitor

Inductor

motor

light bulb

heating element

Active and Passive Elements

ECE 201 Circuit Theory I

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