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4,5 V and 1,5V batteries

Direct current (DC or "continuous current") is the flow of electricity in a single direction, from the positive to the negative terminals (potential, poles).

The direct current always flow in the same direction, distinguishing it from the alternating current (AC). Direct current used to be called "Galvanic current".

Types of direct current

Batteries are some of the main sources of direct current (DC), but many other sources also exist such as bridge rectifiers in power supply, solar panels, etc. view more...