Final answer:
A rectifier is used to convert AC to DC, using diodes to create a one-way flow of current.
Step-by-step explanation:
The piece of equipment that converts alternating current (AC) to direct current (DC) is called a rectifier. A rectifier uses components such as diodes to allow the one-way flow of electric current, thereby converting AC, which alternates direction, to DC, which flows in a single direction. While devices like solar cells produce DC, many household appliances and the power grid require AC; thus, an inverter is used to convert solar DC to usable AC.