Understanding the Concept of Negative Current

The flow of positive current is commonly depicted as moving from the positive terminal of a power source to the negative terminal, despite the fact that electrons actually move in the opposite direction. Therefore, the initial part of the cycle is considered positive. Does the direction of the temperature gradient caused by the current change when I supply a negative current as opposed to a positive current?
Solution 1: If the power supply is providing a positive current towards the ground, it means that positive charge is flowing from the supply to ground.


While voltage can be negative as it is relative to ground, I am currently examining the ACS712 current sensor. In its performance specifications, it states the following regarding
characteristics table
: the range for current measurement is from

-5 A


+5 A

, expressed in Amps.

The table

No information can be found explaining the possibility of negative amperage. To my understanding, electric current refers to the speed at which electric charge flows through a circuit or a portion of it.

In what way could the sensor detect a negative flow of charge?

Solution 1:

Comprehend that ground serves as a reference point for voltage.

I have a preference for disagreeing, as a voltage opposes a reference point, which is often ground but not necessarily.

In light of the aforementioned, your current is defined in the same manner.

By selecting a pin/port of a component or circuit, you have the option to designate the current entering that port/pin as positive. Consequently, if the current exits from that port/pin, it will be considered negative.

Solution 2:

The device allows the current to flow in any direction.

Similar to the alternating polarity of AC mains voltage over a load, the
current flows
will also rotate either in a clockwise or counter-clockwise direction within the loop via the load.

Solution 3:

The flow of electric charge, referred to as electric current, can occur in either direction. This is why there are positive and negative charges, as it depends on the chosen reference point.

Solution 4:

It’s currently moving in the opposite direction of the positive direction, without any additional factors.

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