In power applications, switches perform function to energize or unenergized an electric load. On the high end of the scale are load-break switches and disconnecting switches in power systems at the highest voltages (several hundred thousand volts).

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Pulse-oximetry technology was available in 1930’s it became easily available only in the 1980’s with advances in the Light Emitting Diode (LED), microprocessors, optical plethysmography and spectro-photometry. Today pulse-oximetry provides a simple, non-invasive, portable and inexpensive method to continuously monitor oxygen saturation and heart rate with good accuracy.

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