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Current source
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<p>A current source is an <a href="/facts/Electronic_circuit/IRfQ6Cc2">electronic circuit</a> that delivers or absorbs an <a href="/facts/Electric_current/Dc1xdnUX">electric current</a> which is independent of the <a href="/facts/Voltage/EN2po6N2">voltage</a> across it. </p><p>A current source is the <a href="/facts/Duality_(electrical_circuits)/280zPcML">dual</a> of a <a href="/facts/Voltage_source/aAIbDymf">voltage source</a>. The term <i>current sink</i> is sometimes used for sources fed from a negative voltage supply. Figure 1 shows the schematic symbol for an ideal current source driving a <a href="/facts/Electrical_load/IX0XBAqB">resistive load</a>. There are two types. An <i>independent current source</i> (or sink) delivers a constant current. A <i>dependent current source</i> delivers a current which is proportional to some other voltage or current in the circuit. </p>