pls explain the line---if the electric current is purely resistive,i.e.a configuration of resistors only connected to a battry;the source energy continually gets dissipated entirely in the form of heat.

It says that if the circuit contains only resistance across a source, then all the energy the battery provides to the electron for them to go around the circuit, is all converted into heat, since as the electrons flow through resisitvie path they lose energy. This energy is only heat and not in any other form, which can be magnetic, inductive.

Regards,

Team,

TopperLearning.