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Voltage and Current Sources Circuit Symbols

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 Sources Circuit Symbols

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  1. Voltage and Current SourcesCircuit Symbols ECE 201 Circuit Theory I

  2. 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

  3. “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

  4. 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

  5. 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

  6. 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

  7. 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

  8. Common-Emitter Transistor Amplifier ECE 201 Circuit Theory I

  9. The transistor and its equivalent circuit ECE 201 Circuit Theory I

  10. Substituting the equivalent circuit for Q1 ECE 201 Circuit Theory I

  11. 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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