What is the difference between direct current (DC) and alternating current (AC)?


Direct Current (DC)

Alternating Current (AC)

The electric charge flows in only one direction, from the positive terminal to the negative terminal. It maintains a constant polarity.

The direction of the electric charge reverses periodically. It constantly changes direction, moving back and forth, creating a cycle.

The voltage in DC remains constant in terms of polarity. It doesn’t switch between positive and negative.

The voltage in AC continually changes polarity. It alternates between positive and negative values.

Commonly used in batteries, electronic devices, and many small appliances because they require a constant voltage and current.

AC is used for power distribution in homes and businesses because it can be easily transformed to different voltages and is more efficient for long-distance transmission.

DC can be generated using devices like batteries and solar cells.

AC is typically generated by power plants and generators, as it is more practical for large-scale power generation and distribution.


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