OK guys,

For example, I had a circuit breaker rated for 5 amperes. It means that I should not use more than eleven 0.4166667 amp rated bulb. Isn't it?

Because eleven 0.4166667 amp rated bulb is consuming already total all 4.5833337 amperes.

Please correct me if I were wrong.

 

The bulb only pass that much current when it is lit and hot.

The resistance of filament lamp is much lower when it is cold.

 

But when the bulbs are all lighted, my chosen fuse is correct?

Thanks!!!!

 

fuses typically shall be run at no more than 80% continuous. 5A fuse = 4A maximum continuous. I'd use a 7A fuse minimum.

 

If your talking AC mains then your local code will dictate.

 

Most Breakers are rated for 80% continuous load. Check the manufacturers cut sheets to be sure. This includes the types that are used in businesses and homes. Just thought I would throw in my two cents.

 

5A fuse enough for your circuit. Go ahead.

 

It's only 12 volts. So as saikat36 said, it's enough, I guess so too...