Trimmer

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Electric hair trimmers work in the same way as manual ones, but are driven by an electric motor which makes the blades oscillate from side to side. They have gradually displaced manual hair clippers in many countries. Three different motor types are used in clipper production: magnetic, rotary and pivot. Rotary style may be driven by direct current or alternating current electricity source. Both magnetic and pivot style clippers use magnetic forces derived from winding copper wire around steel. Alternating current creates a cycle attracting and relaxing to a spring to create the speed and torque to drive the clipper cutter across the combing blade.Blades are usually made of rust-resistant stainless steel. Ceramic cutters are available; they are not subject to corrosion, and stay sharper longer because of a higher resistance to wear than metal blades. They remain cool to the touch even with fairly prolonged use, as ceramic is a poor heat conductor. However, ceramic blades are brittle and easily broken, and more expensive to replace than metal blades.[