# Comments: Alternating Current (AC) vs. Direct Current (DC)

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• Member #1440765 / about 6 years ago / 1

can a direct current vary with time. For an example like an exponent signal, ramp signal.

• Member #1590822 / about 4 years ago / 1

Definitely a DC current can vary with time. I came to know about it from the article on askanydifference. you can search google images for "dc current diagonal graph" to see the graph

• In theory, DC is not supposed to vary with time, but it practice, you will often find direct currents that vary. For example, a rectified AC signal or the output of a buck or boost converter will have some ripple to it (even though it's usually considered "DC"). Even a battery will lose some of it's voltage over time.

This post gives some good examples with graphs.

• Member #1433082 / about 6 years ago / 1

Can direct current be converted to AC current?

• Yes it can! One way to do that is through a device called an inverter.

• Member #546742 / about 10 years ago / 1

Higher voltage means low current? What if low voltages, will it means low current too?

• That's not necessarily true. If we are talking about converting AC or DC to a different voltage, then the maximum possible current will change. If we convert voltages (in either AC or DC), then power stays the same (assuming 100% efficiency in your converter). Since P = V * I, if you decrease voltage, then current must rise to keep power the same. Hope that makes sense.

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