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Which insulating material is used for making switches? Ans:1. Plate or switchboard: This is the part that contains the  electrical switches  or sockets. It can be made of a number of  materials , ranging from metal to glass and even wood or leather. However, Polycarbonate is the most common  material used . 2. Switch: The rocker switch is almost always made of Polycarbonate. However, only the finest switches like that by Anchor are made of fire-retardant material (Polycarbonate of V0 grade and Urea Formaldehyde) which can be a boon in case of any untoward incidents. Some switches may also contain an LED light which indicates the switch is in ON / OFF position. 3. Housing: This is the main body of the switch and is made of insulating or non-conducting material like plastic. 4. Contact Terminals: These are made of brass material. Brass is a good electrical and thermal conductivity and ease of forming, combined with good corrosion resistance, makes brass an ideal c...

Piezoelectric  sensor Is piezoelectric AC or DC? A vibrating piezoelectric device generates an ac voltage while electrochemical batteries require a dc voltage, hence the first stage needed in an energy harvesting circuit is an ac–dc rectifier connected to the output of the piezoelectric device How long do piezoelectric crystals last . Due to the nature of the crystalline formation, transducers will naturally decay over time (3-6 years typically) in their ability . Quartz is quite a good insulator so, as long as the PD is low enough to prevent a discharge, I would have thought the meter reading would stay the same Piezoelectricity  was discovered by two French scientists’ brothers,  Jacques  and  Pierre Curie , in 1880. They found out about piezoelectricity after first realizing that pressure applied to quartz or even some certain crystals creates an electrical charge in that certain material.They later referred t...