This chapter explains about nature of electricity, potential, Current, Resistance, Flow of electricity (magnetic effect, Heating effect), faraday’s laws of electrolysis, electricity and human body, ECG, EEG, EMG, ECT, Electromagnetism, laws of electromagnetic induction (faraday’s law, Lens law), Fleming’s right hand rule, self and mutual induction, CT scanning, MRI scanning (Larmor frequency, Resonance, T1T2 relaxation) and Application in nursing