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Sinking vs Sourcing

Basic DC Circuits:

In a DC circuit, power flows in one direction: from the positive side of the power source, through the load, to the negative side of the power source.

DC Circuit

To switch the load, you can place the switch either in front of the load (on the positive leg of the circuit) or behind the load, on the negative leg.

Sinking Switch Circuit

Sinking is switching the load in the negative leg of the circuit, as shown here.

Sinking Switch Circuit

Sourcing Switch Circuit

Sourcing is switching the load in the positive leg of the circuit, as shown here.

Sourcing Switch Circuit

Also Read: Difference Between Sinking & Sourcing Current

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3 comments

Justin Brockway July 21, 2016 at 4:38 am

The present adopted theory is that Current (I) flows from Negative (-) to Positive (+) through the load. (Electron Flow Theory)
-also, “power” is the term associated with Watts consumed by the Resistance when Current flows through the load, due to potential (E); therefore “power” is not a “thing” and cannot “flow”

Reply
S Bharadwaj Reddy July 21, 2016 at 5:35 am

Thank you Justin for sharing the knowledge.

Reply
Shanmugam Iyappan October 12, 2016 at 5:35 am

Fantastic explanation, Thanks!

Reply

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