EE - ASSIGNMENT # 2
A voltage source either provides energy to a circuit (Primary Source) or dissipates energy
from the circuit (Secondary Source). When looking at voltage sources, an ideal voltage
source is modeled. An ideal voltage source is a voltage source that maintains the same
voltage across the source's terminals no matter what current is drawn from the terminals of
the source or what current flows into the terminals. This means that it has zero internal
resistance. In circuit analysis this modeling of ideal source makes problems simple.
Cells, batteries, capacitors are examples of voltage sources. To deal with non-ideal sources
we can use Thevenin Equivalent Circuits or Norton Equivalent Circuits. In either case at
least one component of the equivalent circuit is an ideal source - even though the equivalent
is used to represent a non-ideal source.
A current source is the reminiscent of voltage source. A current source is an electrical or
electronic device that delivers or absorbs electric current. Just like the ideal voltage source,
an ideal current source is also modeled. In an ideal current source the current supplied
remains constant no matter what the terminal voltage is. Here the internal resistance is
infinite.
A simple voltage source with a resistor is an example of current source. Another example is
a simple transistor with LED source. Sometimes operational amplifiers with a feedback
configuration can also be used as current sources.
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