What is the different between rms current and dc current?

Root-mean-square (r.m.s.) values are applied to alternating currents and voltages. The r.m.s. value of an a.c. current and a d.c. current of the same value will both do exactly the same amount of work. For example, 10 A (r.m.s.) is exactly equivalent to 10 A d.c. because they will both do exactly the same amount of work.