DC Voltage

Yes. It's called a power supply. Google it.

Yes because 24 is between 10 and 30.
Del

Yes it works at 24v dc...

hi it can work very good the device with 10 - 30 is mean it work wiht supply from 10 to 30 v dc and the 24 is in the range

good day

ali

in what universe does 24 not come in between 10 & 30 ?

and also by 24V u mean that it is 24V dc right and not 24v AC or -24V dc . i wouldn't have asked this question but it looks like i have got no choice.

Assuming that in the second part of your question you are asking why it is that a device can have a power requirement WITHIN a wide range such as 10-30VDC.

The reason is, your device ACTUALLY works on some lower voltage, such as 10VDC or even 5VDC; for discussion let's say it is 5VDC (because that is a typical TTL voltage).

Then INSIDE of your device there is an embedded DC/DC power supply that CREATES the necessary 5VDC filtered power that your circuit board needs, and it can do that by "chopping" up a higher voltage level. Look up the concept of a "DC Chopper Circuit" to see one simplistic method in which that is done.

So with that, all you need is a reasonably stable source of DC power, at a potential somewhere at or above the level you need, because the low cost and very small DC/DC converter can easily REDUCE the voltage for the point of use, but BOOSTING it would require more circuitry. So if you need 5VDC, you have to start with something that is more than 5VDC and starting with 10VDC gives you a nice buffer against other irregularities. But everything has tolerances and power creates heat, so you don't want to have to deal with too much potential, hence the limit of 30VDC.

a dc motor's rpms might change at different voltages.