Which type of current is associated with constant direction flow?

The type of current associated with a constant direction of flow is direct current (DC). In a DC circuit, the electrons flow steadily in one direction, producing a consistent voltage. This characteristic is essential for various applications, such as in batteries, where the power supply needs to remain constant and predictable, with the same polarity at all times.

In contrast, alternating current (AC) can change direction periodically, which means that the flow of electrons oscillates back and forth rather than maintaining a single direction. This oscillation is fundamental to how AC is used in power generation and distribution, but it does not align with the concept of constant direction flow.

Resistive current is a term that can refer to current flowing through a resistance, but it does not inherently imply a constant direction. Instead, it describes how a current behaves when passing through a resistor, irrespective of whether it is AC or DC.

Electric current is a broader term that encompasses both AC and DC as well as any flow of electric charge. It doesn't specify the direction of flow. Thus, while electric current is inclusive of various types, it's the direct current that specifically denotes a continuous flow in one direction.