Electromagnetic interference (EMI) is electromagnetic energy that adversely affects the performance of electrical/electronic equipment by creating undesirable responses or complete operational failure. Electromagnetic interference is the degradation in the performance of a device due to the fields making up the electromagnetic environment.

Effects of EMI:

• Momentary disturbance in TV and radio reception due to operation of mixer- grinder/electric shavers/a passing vehicles etc
• Reset of computers and loss of data.
• Change of setting of status of control equipments.
• Failure of pace maker implemented in a patient due to a „walkie talkie‟
• Malfunctioning of flight controlling system due to use of laptop by passenger.
• Biological hazards.

Sources of EMI:-