【Daily Question】How to correctly associate directed and undirected directions

In a circuit: if the reference direction of the current flowing through a component is specified as going from the end marked with the positive voltage polarity to the end with the negative polarity, that is, if the reference directions of both are the same, then this reference direction for current and voltage is called a correlated reference direction. When the two are inconsistent, it is called a non-correlated reference direction. The production regions are looking forward to your joining – “Huoxiang Zhengqi, to prevent heatstroke.” http://bbs.hcbbs.com/thread-1421676-1-1.html (Event post & spending money)

In a circuit: if the reference direction of the current flowing through a component is specified as going from the end marked with the positive voltage polarity to the end with the negative polarity, that is, if the reference directions of both are the same, then this reference direction for current and voltage is called a correlated reference direction. When the two are inconsistent, it is called a non-correlated reference direction.

1. For a circuit element, when the reference directions of its voltage and current are the same, it is generally referred to as an associated reference direction； 2. In the case of a related reference direction, if the component’s power is positive, it indicates that the component consumes power ； Conversely, if the component power is negative, it indicates that the component is emitting power. 3. When the reference directions of the voltage and current of a circuit element are opposite, it is usually referred to as a non-associated reference direction. 4. In the case of non-correlated reference directions, all of the above conclusions are reversed; that is, when the component’s power is positive, it indicates that the component is emitting power ； When the component power is negative, it indicates that the component consumes power.

1. For a circuit element, when the reference directions of its voltage and current are the same, it is generally referred to as an associated reference direction； 2. In the case of a related reference direction, if the component’s power is positive, it indicates that the component consumes power ； On the contrary, if the power of a component is negative, it indicates that the component is emitting power. 3. When the reference directions of the voltage and current of a circuit component are opposite to each other, this is usually referred to as non-associated reference directions. 4. In the case of non-associated reference directions, all of the above conclusions are reversed; that is, when the power of a component is positive, it means that the component is emitting power ； When the component power is negative, it indicates that the component consumes power.

In a circuit: if the reference direction of the current flowing through a component is specified as going from the end marked with the positive voltage polarity to the end with the negative polarity, that is, if the reference directions of both are the same, then this reference direction for current and voltage is called a correlated reference direction. When the two are not consistent, it is called a non-associated reference direction

In a circuit, the reference directions of voltage and current are the same. That is, the reference directions of positive and negative are the same; we refer to this reference direction for current and voltage as the associated reference direction. If they are not consistent, it is called a non-associated reference direction.

In a branch, the direction of current is considered to be the associated direction when it flows from the positive terminal to the negative terminal; otherwise, it is the non-associated direction. For branches that consume power (such as resistors), the current always flows from the positive terminal to the negative terminal, so the associated direction should be used. For branches that supply power, the current flows from the negative terminal to the positive terminal when power is output, and thus the non-associated direction is typically used. There is only one power source in this problem, and it definitely outputs power, so the non-associated direction is applied. In fact, using the wrong direction does not affect the calculations; when the assigned direction is opposite to the actual one, the calculation results will be negative, and the actual direction can be determined from these results

To determine this issue, we must start with the basic concepts: to assess the consistency of the two bolded concepts here, the associated reference direction refers to the direction in which the current flowing through a component goes, from the high potential end of the component to the low potential end; this is the associated reference direction, whereas otherwise it is an unassociated reference direction

How to correctly determine the associated and non-associated directions? The reference direction of the current flowing through a circuit element is from the high voltage side to the low voltage side as indicated on the element, which constitutes the associated reference direction. Inconsistency indicates non-associated reference directions.

1. For a circuit element, when the reference directions of its voltage and current are the same, it is generally referred to as an associated reference direction； 2. When the reference directions of the voltage and current of a circuit element are opposite, it is commonly referred to as non-associated reference directions.