Voltage and Current Sources Circuit Symbols

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# Voltage and Current Sources Circuit Symbols - PowerPoint PPT Presentation

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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### Voltage and Current SourcesCircuit Symbols

ECE 201 Circuit Theory I

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
• 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
• 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
• 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
• 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
• 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

ECE 201 Circuit Theory I

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