An electric generator converts :
(a) electrical energy into mechanical energy
(b) mechanical energy into hear eneregy
(c) electrical energy into chemical energy
(d) mechanical energy into electrical energy
A microphone converts :
(a) electric energy into sound energy in ordinary telephone
(b) microwave energy into sound energy in a mobile phone
(c) sound energy into mechanical energy in a stereo system
(d) sound energy into electrical energy in public address system