4.4. Energy Consumption Energy consumption is directly dependent on computation complexity. It is assumed that .0001 joule energy is consumed in every computation. The energy of the node i, Energy (i), for NC computations is calculated with the help of following formula:- Energy(i) = Energy(i) - 0.0001* NC Decrease in energy for XTEA is shown by red color and that of RC5 is in blue color. As shown by the Figure 4, constant amount of energy is consumed in every round of encryption. Sharp declination shows that the initialization energy consumption is very high in RC5 and very low in XTEA and also the energy required while the rounds of encryption is low in XTEA than RC5.