what is the source of electrical energy in galvanic ccell ?
Your friend is correct.
Spontaneous redox reaction is the source of electrical energy in galvanic cell. Or we can say that Galvanic cell is used to convert chemical energy of a spontaneous redox reaction into electrical energy.
Spontaneous redox reaction is the source of electrical energy in galvanic cell. Or we can say that Galvanic cell is used to convert chemical energy of a spontaneous redox reaction into electrical energy.