"The sum of emf's and potential differences around a closed loop equals zero" is a consequence of :

The statement describes Kirchhoff's Voltage Law (KVL), also known as the loop rule, which states that the algebraic sum of potential differences and electromotive forces (EMFs) around any closed loop in a circuit is zero. This principle is a direct consequence of the law of conservation of energy. In a closed circuit, as a charge moves around a loop and returns to its starting point, the total energy gained from EMF sources must equal the total energy dissipated across resistive elements. Since electric potential is defined as potential energy per unit charge, the fact that the potential returns to its original value after a complete circuit confirms that no net energy is created or destroyed within the loop. In contrast, Kirchhoff's Current Law (the junction rule) is based on the conservation of charge.