Questions about fans and voltage/current.

[DatGameh]

Some time in the future, I want to do an experiment that involves the use of some computer fans.
Blowers and normal 120mm fans.
I've seen some fans, and saw some of them rated for 12v and 140mA.
To supply power to the fans, I found a phone-like power supply with switchable voltage.
It supplies 3v, 4.5v, 6v, 7.5v, 9v and 12v. But it can only supply 500mA.

If I search more, I might be able to find a fan with higher rating.
But in case I can't, what problems might I face with overcurrent?
Overvoltage causes the fan to spin faster, but I haven't seen a case with too much current.

But, considering the available voltage options, is there a possibility to use this power supply to power the fans without damaging them?

Thanks!

 

[CountMike]

If you overpower any power supply it may brake/blow and/or melt. Most computer cooling fans run full speed at 12vDC with starting voltages 7.5 - 9VDC.

 

[DatGameh]

If you overpower any power supply it may brake/blow and/or melt. Most computer cooling fans run full speed at 12vDC with starting voltages 7.5 - 9VDC.

But, uh... Back to my original question
What happens when you overcurrent it, instead of overvolt?

 

[CountMike]

You can't really "overcurrent" fans or any other electrical component. You could connect a nuclear power plant to it and it will still pull only the power it's rated for.

 

[DatGameh]

You can't really "overcurrent" fans or any other electrical component. You could connect a nuclear power plant to it and it will still pull only the power it's rated for.

No, no, it's not the power supply that's at fault
I'm using this powersupply
https://www.tokopedia.com/florenselectric/adaptor-charger-power-supply-500ma-montana-multi-output-dc?src=wish&type=1
It's Indonesian, but you'll see some of the specifications listed.
It outputs multiple voltages, but at a constant current of 500mA.
This is the fan I want to use:
https://www.tokopedia.com/lubeg-store/intel-ori-cpu-heatsink-fan-89x62x33-mm-peltier
The voltage it accepts is 12v, but it only accepts 0.25mA

Will the fan explode or something?

 

[CountMike]

Wrong again, it's not that it "Accepts 0.25A" it draws maximum 0.25A, It doesn't matter how much power PSU can supply.
As I said before, you could connect that fan to a nuclear plant and it would still use 0.25A out of gigaamps it can supply and nothing would happen to it.
Just plain physics.

 

[DatGameh]

Wrong again, it's not that it "Accepts 0.25A" it draws maximum 0.25A, It doesn't matter how much power PSU can supply.
As I said before, you could connect that fan to a nuclear plant and it would still use 0.25A out of gigaamps it can supply and nothing would happen to it.
Just plain physics.

Ah
I see now
Never actually knew that. Sorry for the misunderstanding.
So electronics draw only their rated current, but can still be over-volted?
I expected the wires to overheat from the current, at the very least.
But thanks, anyways!

 

[CountMike]

Yes, you can overvolt but that may burn it down if you overdo it. At lower Voltage it would run slower so you can regulate speed by switching Voltage.
Please consult one of Ohm's laws: W (Wattage, actual work done) = A(Amperage) * V(Voltage). A = W/V and V = W/A It's very basic of electricity.