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What is the internal impedance of a dependent voltage source?
zero
The internal resistance of an ideal voltage source is zero; it is able to supply or absorb any amount of current. The current through an ideal voltage source is completely determined by the external circuit. When connected to an open circuit, there is zero current and thus zero power.
Does a dependent current source have resistance?
Conversely, if the current through an ideal current source is determined by some other voltage or current in a circuit, it is called a dependent or controlled current source. Symbols for these sources are shown in Figure 2. The internal resistance of an ideal current source is infinite.
How does a dependent current source work?
A controlled or dependent current source on the other hand changes its available current depending upon the voltage across, or the current through, some other element connected to the circuit. In other words, the output of a dependent current source is controlled by another voltage or current.
What do you mean by dependent and independent voltage sources?
An independent voltage source maintains a voltage (fixed or varying with time) which is not affected by any other quantity. They are called dependent voltage (current) sources or controlled voltage (current) sources , and their usual symbols are shown in figure 1.4.
Can a current be dependent on a voltage?
For example, a current source could be dependent on a voltage while a voltage source could be dependent on a current. It’s just a mathematical representation. It will cause some things that look odd at first, like 0.5v 1 amps, but it’s perfectly natural.
How to design independent and dependent voltage source problems?
In a circuit model for independent and dependent voltage source problems, you could specify different output impedance values for the independent source. When designing an independent AC source, you will want to examine how the function defining the output voltage changes as a function of frequency.
What does a dependent source in a circuit look like?
Sometimes, there are things like dependent sources, or sources that change their output depending on other parts of the circuit. Their symbols look like this: On occasion, such as with a current mirror, a power source in real life depends on the voltage or current in another portion of the circuit.
What should the output impedance be for an independent source?
Ideally, the output impedance spectrum will be flat over a large range of frequencies, and this is normally the case for adjustable AC power supplies. In a circuit model for independent and dependent voltage source problems, you could specify different output impedance values for the independent source.