Can this blue potentiometer be used for the load of the switching power supply?

electricor

The power supply output is 5v, and the current requirement is 3A. I want to test whether the current can reach 3A when the voltage reaches 5v When connecting the load, I wonder if this blue potentiometer can be used as a load? If not, what kind of sliding transformer should be used as a load? I only need (5v divided by 3A equals) a 1.6 ohm resistor, and I wonder if I need to consider whether the rated current of the potentiometer can pass 3A.

仙猫

5V×3A＝15W The load resistor must be able to withstand at least this much power. You can check the device manual to find out whether it can be used.

pcf2000

It seems not feasible. It is recommended to use a power resistor. If one is not enough, you can connect several in parallel and connect an ammeter in series.

electricor

Xianmao posted on 2018-8-16 22:46 5V×3A＝15W The load resistor must be able to withstand at least this much power. You can check the device manual to find out if it is possible.

OK, thank you for your answer. Do I only need to consider the power and not the rated current?

ilovefengshulin

Just buy a cement adjustable resistor

xujian2000

The one shown in the picture is for signal adjustment, not for testing the output power of your power supply. Suggestion: You can use a wirewound resistor.

qwqwqw2088

Sliding rheostat is OK, high power is OK

maychang

No. This potentiometer can only dissipate very little power, less than 1W. And your switching power supply has a maximum output of 15W.

maychang

You can use ordinary electric furnace wire and cut it to the appropriate length as the load of your switching power supply.

ddllxxrr

No, the power is not enough, it will burn if you put it on

constant

You can use cement resistors, which have relatively small resistance values. If they are not enough, you can use them in parallel. You can test 50W.