No they don't?
Electric shavers work differently from conventional blade razors by using a scissor-like cutting action, instead of direct blade-to-skin contact. The hairs enter the perforated screen of the razor and the moving blades on the inside of the electric razor sever them at that point. These blades are connected to an oscillating motor that moves them in a circular motion against the foil between the shaver and your skin.
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Electric shavers work differently from conventional blade razors by using a scissor-like cutting action, instead of direct blade-to-skin contact. The hairs enter the perforated screen of the razor and the moving blades on the inside of the electric razor sever them at that point. These blades are connected to an oscillating motor that moves them in a circular motion against the foil between the shaver and your skin.