What are the different Sign Conventions used in electric circuits?

It is common to think of current as the flow of electrons. However, the standard convention is to take the flow of protons to determine the direction of the current.
In a given circuit, the current direction depends on the polarity of the source voltage. Current always flow from positive (high potential) side to the negative (low potential) side of the source as shown in the schematic diagram of Figure 2.4(a) where Vs is the source voltage, VL is the voltage across the load and I is the loop current flowing in the clockwise direction.
In Source current leaves from the positive terminal
In Load (Sink) current enters from the positive terminal.

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