When current flows through a resistance is heat produced?

Yes, heat energy is produced by the electrons;however small it may be,actually if we consider a resistance then it is an hindered to the flow of electrons,as a result of which the electrons collide with the particles of wire resulting in loss of energy in the form of heat.the equation of heat generated is:

H=(I^2 *R*t)

where-

H=heat produced in joules

R=resistance of the material in ohm

t=time of current flow in seconds