Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits
Types of Sources
Electrical Circuits
According to their terminal voltage-current characteristics, energy source are categorized into ideal voltage sources and ideal current sources.
TYPES
OF SOURCES
According
to their terminal voltage-current characteristics, energy source are
categorized into ideal voltage sources and ideal current sources.
Ideal voltage source:
An
ideal voltage source is a two terminal element in which the voltage Vs
is completely independent of the current is through its terminals.
An ideal voltage source is shown in fig 1.7.
It
is observed that V-I characteristics for an ideal voltage source at any time
the value of the terminal voltage Vs is constant with respect to the
value of current is
Practical voltage source:
In
practical voltage sources, the internal resistance is represented in series
with the source. In this, the voltage across the terminals falls as the current
through it increases. The terminal voltage Vt = Vs - is
R. Practical voltage source is shown in fig 1.8.
Ideal current source:
An
ideal current source is a two terminal element in which the current is
completely independent of the voltage Vs across its terminals. An
ideal current source is shown in fig 1.9.
At
any time value of the current is is constant with respect to the
voltage across it.
Practical current source:
In
many practical current sources the resistance is in parallel with a source. The
magnitude of the current falls as the voltage across its terminals increases.
The terminal current it = is – ﴾VS /R﴿. Practical current source is shown fig 1.10.
Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits : Tag: : Electrical Circuits - Types of Sources
Basic Electrical and Electronics Engineering: Unit I: Electrical Circuits
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