Nuclear technology involves atomic nuclei reactions which are used to generate energy. The product of nuclear reactions has huge advantages in Medicine, Agriculture, power generation, Water Desalination etc. However This technology can be misused to produce nuclear bombs (atomic bombs) Which are very dangerous weapons of mass destruction.
Since nuclear reactions involve chain (continous) reactions, they effective damage of detonating a nuclear bomb is huge.
Electric power and electrical energy are related because electrical energy comes from electrical power. If one comes from the other, they are related. Hope this helps!
