Voltage Vs Current Source

Practically an ideal voltage source cannot be obtained.

Voltage vs current source. In fact one can approximate a current source with a high voltage source in series with a large resistance. A current source which provides a constant current without any relation with the voltage supplied to the load is called ideal current source. A voltage source is a two terminal device whose voltage at any instant of time is constant and is independent of the current drawn from it. The current source produces a fixed current that is ideally independent of the load attached to the source.

When there is a closed loop path between these two points it is called a circuit and current can flow. An ideal current source always generates its exact rated current and is not affected by the characteristics of the circuit to which it is connected. Such a voltage source is called an ideal voltage source and have zero internal resistance. In an electric field the potential difference between any two points is called as voltage difference.

Whereas good voltage sources have very low internal resistance good current sources have very high internal resistance. In the absence of a circuit current will not flow even if there is voltage. Figure 1 shows the schematic symbol for an ideal current source driving a resistive load. Sources having some amount of internal resistances are.

Real life current sources like real life voltage sources are non ideal and must be represented by an ideal source in conjunction with at least one additional component. The types of sources available in the electrical network are the voltage source and the current source the voltage source is used to provide voltage to the load while the current source is used to apply current. A voltage source has two points that have a difference in electrical potential. Summary voltage vs current.

Anatomy of a virtually ideal constant current source. A current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it. A current source which provides a constant current without any relation with the voltage supplied to the load is called ideal current source and in practical current source internal resistance is very high compared to the external resistance of the circuit but not infinite. To have a clear understanding it would be necessary to discuss both ideal and practical versions of voltage source and current source.

A source is a device which converts mechanical chemical thermal or some other form of energy to electrical energy. A current source is the dual of a voltage source the term current sink is sometimes used for sources fed from a negative voltage supply. There should always be a voltage difference to generate a current.