Is our cosmic horizon the same as that of being in another galaxy?

Yes, because of the Hubble's constant which states no matter where your galaxy is any observer see the same law.

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.

small = small current large mag large current