Electrical Energy Sources
Energy sources:
Basic types:
1.
Voltage source:
-
Energy source which gives
voltage across its terminals.
-
Ideal voltage source is the
energy source which gives constant voltage across its terminals irrespective of
the current drawn through its terminals
-
In practical, due to small
internal resistance of the voltage source, voltage is dependent on the load.
2.
Current source:
-
Energy sources which gives
current across its terminals.
-
Ideal current source is the
energy source which gives constant current across its terminals irrespective of
the voltage appearing its terminals
-
In practical, every current
will have a high internal resistance.
Based upon the dependency, energy sources
are classified as:
1.
Independent sources:
-
The value of the energy source
is independent on all other characteristics of the circuit.
2.
Dependent sources:
-
Value of the energy source is
dependent on the voltage or current elsewhere in the circuit.
a)
Voltage dependent voltage
source (VDVS):
§ Provides voltage as a function of voltages elsewhere in the circuit.
b)
Current dependent current
source (CDCS):
§ Provides current as a function of current elsewhere in the circuit.
c)
Current dependent voltage
source (CDVS):
§ Provides voltage as a function of current elsewhere in the circuit.
d)
Voltage dependent current
source (VDCS):
§ Provides current as a function of voltage elsewhere in the circuit.
Note: Four terminals are required to define
a controlled source/dependent source whereas two terminals are enough to define
a uncontrolled source/independent source.
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