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How many types of dependent sources are there?
4
5
2
6
4
Dependent sources, also known as controlled sources, are circuit elements where the terminal voltage or current is determined by a voltage or current at another location in the circuit. There are exactly 4 types based on the control variable and the output quantity.
Dependent sources, also known as controlled sources, are circuit elements where the terminal voltage or current is determined by a voltage or current at another location in the circuit. There are exactly 4 types based on the control variable and the output quantity.
Vout=μVin — Voltage-Controlled Voltage Source (VCVS)
Iout=gmVin — Voltage-Controlled Current Source (VCCS)
Vout=rmIin — Current-Controlled Voltage Source (CCVS)
Iout=βIin — Current-Controlled Current Source (CCCS)
A dependent source acts as a transfer function between two parts of a circuit. It can be categorized into four types: Voltage-Controlled Voltage Source (VCVS), Voltage-Controlled Current Source (VCCS), Current-Controlled Voltage Source (CCVS), and Current-Controlled Current Source (CCCS).
VCVS: The output voltage is dependent on an input voltage.
VCCS: The output current is dependent on an input voltage.
CCVS: The output voltage is dependent on an input current.
CCCS: The output current is dependent on an input current.
Essential for modeling active electronic devices like transistors and Op-Amps.
Allows for the analysis of feedback systems in electronic circuits.
Cannot exist independently; they require an external input variable.
Calculations in node/mesh analysis become more complex due to constraints imposed by the control variables.
Modeling the behavior of Bipolar Junction Transistors (BJT).
Modeling operational amplifiers and field-effect transistors (FET).
The 4 types arise from the combinations of 2 input types (Voltage or Current) and 2 output types (Voltage or Current).
Option B (5), C (2), and D (6) are incorrect as they do not match the fundamental categorization of linear controlled sources.
A is correct — There are 4 distinct types of dependent sources classified by their input-output control characteristics.
When performing Nodal or Mesh analysis, remember that dependent sources introduce an extra constraint equation, which must be solved alongside your primary KCL or KVL equations.
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