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Voltage Sources vs. Current Sources

Voltage and Current Sources

Voltage Source

  • A voltage source maintains a fixed supply voltage to an electrical circuit - independent of the circuit load resistance and the applied current.

Current Source

  • A current source maintains a fixed supply current through an electric circuit - independent of the circuit load resistance and applied voltage.

Note that real voltage and current sources have limits to the voltage/currents they can provide. A voltage source "prefer" open circuits (no connection between the poles) and current sources "prefer" closed circuits (short cuts).

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