There are many different kinds of applications for each type of source and it's impossible to mention them all. I'll give just a few examples:
A voltage source is needed when the output voltage has to change as little as possible with different loads, as with a power supply or the output of an audio amplifier.
A current source is appropriate when the output current should remain the same with changes in load. An example would be a wire temperature sensor where the resistance changes in proportion to the temperature. Or in some biasing circuits.
When voltage exists, current flows and hence a "voltage source" will carry current when wires are used to make a closed circuit, right? Then what is the meaning of Voltage source and current source when both co-exist?:?::arrow:
*A voltage source does not "carry a current" - rather it is regarded as the cause of current in a closed loop whereby the amount of current is determined by the impedance characteristic of that loop.
*What do you mean with "co-exist"?
*The other answers depend on your goal:
1.) What is the purpose of the circuit you like to connect to a source (voltage or current) ?
2.) Do you want to model, for example, an active part (or understand an existing model) for simulation purposes? Here, sometimes a combination of ideal voltage and current sources are used for correct modelling. For example, the heart of a bipolar transistor or FET model are controled current sources.
Does this information help?
Current source has an infinite resistance ( or very high ) but it's current due to the each load is constant .Any voltage source together with a large resistance in series makes a current source. A perfect current source would be capable of supplying infinite voltage if necessary, and have a infinite internal resistance.
I can perfectly agree with the quoted statement. It doesn't doubt constant current.I don't think it is correct that
Current source has an infinite resistance ( or very high ) but it's current due to the each load is constant .
I understand however, that question #13 is asking for a physical process, that is generating a current rather than a voltage "by nature". Perhaps a van-de-graaf generator can be considered as such. https://en.wikipedia.org/wiki/Van_de_Graaff_generator .
Yes. I was reading the term "independent" current source as description of a pyhsical device, that act's as a current source. A transistor current source depends on an external supply voltage, it's not sourcing current on it's own.Or a Widlar current source?
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I understand however, that question #13 is asking for a physical process, that is generating a current rather than a voltage "by nature".
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