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What is an example of constant current source?
The common constant voltage sources are the batteries and regulated power supplies. However, batteries cannot supply the constant voltage for a long time and must be recharged or replaced once exhausted. Further, a circuit may require other voltage levels different from what the batteries provide.
What is a constant current source used for?
Current sources can be used to bias transistors and can also be used as active loads for high gain amplifier stages. They may also be used as the emitter sources for differential amplifiers – for example they may be used in the transistor long tailed pair.
What is a practical current source?
A practical current source is a two terminal device having some resistance connected across its terminals. Unlike ideal current source, the output current of practical source depends on the voltage of the source. The more this voltage, the lesser will be the current.
What is an example of an ideal current source?
because then terminal voltage will fall to zero which is not permitted by definition. A practical voltage source ( e.g. generator or battery) can be regarded as an ideal voltage source in series with a low resistance, often called internal resistance (or internal impedance in case of an alternator).
What are practical sources?
Practical voltage sources are real and used in daily life. A practical voltage source has internal resistance that causes a drop in terminal voltage due to the current flow.
What is ideal and practical sources?
Difference between an Ideal and Practical Current Source The ideal current source is supposed to have infinite internal resistance, . Practical Current Source has some internal resistance connected in parallel to Ideal Current Source. And some of the current flow through it and the amount of flow depends upon the load.
Which is an example of a constant current source?
You can see that the current is constant all throughout despite changes in voltage or resistance. A constant current source is a power generator whose internal resistance is very high compared with the load resistance it is giving power to.
How to calculate the constant current in a circuit?
Simple constant current source made from high voltage source and a high value resistor For the circuit above, the current can be calculated very easily as it is approximately I = V / R because Vload (the voltage across the load) is much smaller than V (the voltage of the source). This simple form of current source has many limitations:
How is a practical current source different from an ideal current source?
A practical current source is a two terminal device having some resistance connected across its terminals. Unlike ideal current source, the output current of practical source depends on the voltage of the source. The more this voltage, the lesser will be the current.
Which is an example of both current and voltage?
Batteries can be an interesting example of both a current and a voltage source. A single cell behaves as a voltage source with an internal series resistance, which can also be thought of as a current source with an internal parallel resistance.