Final answer:
Direct current (DC) turns everything into polarity. It is the flow of electric current in only one direction and can be produced by batteries or by using a transformer to convert AC voltage to DC voltage.
Step-by-step explanation:
Direct current (DC) turns everything into polarity.
Direct current (DC) refers to the flow of electric current in only one direction. It is often used in devices such as computers, cell phones, flashlights, and cars. DC can be produced by batteries or by using a transformer to convert AC voltage to DC voltage.
For example, when you connect your device to a battery, the constant potential (DC potential) between its terminals pushes charge in one direction through the circuit, creating a DC current. In the case of solar cells, their output is direct current, but for most home uses, alternating current (AC) is required, so an inverter is used to convert the DC to AC.