DE and AC are related to each other in the field of electrical engineering, specifically in the study of alternating current (AC) electrical circuits.
The first property is that Direct Current (DC) can be converted into Alternating Current (AC) through a device called an inverter. An inverter takes a DC voltage and converts it into a sinusoidal AC voltage of the desired frequency and magnitude.
The second property is that Alternating Current (AC) can be rectified or converted into Direct Current (DC) through a device called a rectifier. A rectifier converts an AC voltage into a pulsed DC voltage. This conversion process can be useful in applications where DC power is required but only AC power is available, such as in battery charging or power supply systems.