Which one of the following is the best description of Piezoelectric Effect ........

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Which one of the following is the best description of Piezoelectric Effect?

It is the ability of certain materials to generate electricity in response to applied magnetic field for a certain period of time.

Piezoelectric effect is the generation of electric charge due to the difference of conductivity of two solutions.

It is the ability of certain materials to generate an electric charge in response to applied mechanical stress.

It is the electrical energy generated due to difference in the temperature at two ends of a metallic rod.

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Explanation:

Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress. The word Piezoelectric is derived from the Greek piezein, which means to squeeze or press, and piezo, which is Greek for “push”. Application: the electric cigarette lighter. A piezoelectric transformer is a type of AC voltage multiplier.