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Post Closed as "Duplicate" by Ignacio Vazquez-Abrams, winny, JRE, Leon Heller, Dmitry Grigoryev
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AznBoyStride
AznBoyStride
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Let’s say a device’s operating voltage is 5V and maximum current that it can draw is 5A.

Is it possible for a 5V power supply to have very low internal resistance such that a device that operates at 5V turns down its resistance in attempt to draw 5A from the power supply , but instead accidentally draws greater than > 5A due to the power supply having very low internal resistance or being “too powerful” ?

Of course this is assuming that the way a basic electronic device draws current is first, it assumes that it is being supplied the correct voltage, and 2nd, it lowers down its resistance at some constant number base on the current it needs to draw

Is this how regular devices such as servo motors draw current? Or can they actually monitor how much current a power supply can give and lowers its resistance base on that?

I know that it is possible to be at operating voltage and still not supply enough current, but could it be possible to be at operating voltage, and supply too much current for a load?

Wait Unless of course, as long as the voltage across the load is less than or equal to the operating voltage, it can never accidentally draw too much current. ( I think I answered my own question, not sure if this is right )

Let’s say a device’s operating voltage is 5V and maximum current that it can draw is 5A.

Is it possible for a 5V power supply to have very low internal resistance such that a device that operates at 5V turns down its resistance in attempt to draw 5A from the power supply , but instead accidentally draws greater than > 5A due to the power supply having very low internal resistance or being “too powerful” ?

Of course this is assuming that the way a basic electronic device draws current is first, it assumes that it is being supplied the correct voltage, and 2nd, it lowers down its resistance at some constant number base on the current it needs to draw

Is this how regular devices such as servo motors draw current? Or can they actually monitor how much current a power supply can give and lowers its resistance base on that?

I know that it is possible to be at operating voltage and still not supply enough current, but could it be possible to be at operating voltage, and supply too much current for a load?

Let’s say a device’s operating voltage is 5V and maximum current that it can draw is 5A.

Is it possible for a 5V power supply to have very low internal resistance such that a device that operates at 5V turns down its resistance in attempt to draw 5A from the power supply , but instead accidentally draws greater than > 5A due to the power supply having very low internal resistance or being “too powerful” ?

Of course this is assuming that the way a basic electronic device draws current is first, it assumes that it is being supplied the correct voltage, and 2nd, it lowers down its resistance at some constant number base on the current it needs to draw

Is this how regular devices such as servo motors draw current? Or can they actually monitor how much current a power supply can give and lowers its resistance base on that?

I know that it is possible to be at operating voltage and still not supply enough current, but could it be possible to be at operating voltage, and supply too much current for a load?

Wait Unless of course, as long as the voltage across the load is less than or equal to the operating voltage, it can never accidentally draw too much current. ( I think I answered my own question, not sure if this is right )

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AznBoyStride
AznBoyStride
  • 149
  • 1
  • 7

Can a power supply be too powerful for a device assuming that the power supply is at operating voltage of the device?

Let’s say a device’s operating voltage is 5V and maximum current that it can draw is 5A.

Is it possible for a 5V power supply to have very low internal resistance such that a device that operates at 5V turns down its resistance in attempt to draw 5A from the power supply , but instead accidentally draws greater than > 5A due to the power supply having very low internal resistance or being “too powerful” ?

Of course this is assuming that the way a basic electronic device draws current is first, it assumes that it is being supplied the correct voltage, and 2nd, it lowers down its resistance at some constant number base on the current it needs to draw

Is this how regular devices such as servo motors draw current? Or can they actually monitor how much current a power supply can give and lowers its resistance base on that?

I know that it is possible to be at operating voltage and still not supply enough current, but could it be possible to be at operating voltage, and supply too much current for a load?