What does a Sourcing Circuit do in an electrical system?

• A. Provides voltage to an electrical load
• B. Provides current from load to supply
• C. Is used to ground noisy signals
• D. Provides cooling to the circuit

Answer: (A)

A sourcing circuit is the part of an electrical system that supplies power to a load by pushing current from the source into the load, establishing the voltage across the load. This means the circuit acts as the provider of drive voltage/current that the load needs to operate. In practice, a sourcing circuit delivers current into the load and is oriented so the load receives power, whereas a sinking circuit would pull current from the load toward the supply. The other described roles—grounding noisy signals and cooling the circuit—do not describe the role of delivering power to a load.