Hi all,

Just a quick question, my power supply has a 5 amp fuse and runs at 12v 5 amps, could i put a 3ohm 100w resistor in series with my ciruit to give me 4 amps of current. Im looking to run this circuit continously, would this trigger the fuse?

 

hi JP,
If your load circuit requires only 4 Amps to operate, it will only draw 4Amps from a 5Amp power supply.
In fact the power supply could be rated at 12V 100Amps and your circuit would still only draw 4Amps.
Is this what you are asking,.?
E

 

No, 4A will not blow a 5A fuse.
Fuses come in many different sizes, and with different specifications, but generally fuses will carry their rated current indefinitely but blow at 125% of that rating.

 

Awesome thanks Albert and Eric!