A measure how it is to stop a moving object

Providing a path for electric charges to flows safely into the ground

An Optical device that produces a narrow bean of contrent light

Any Motion in which an objects is moving along a curved path

An optical device that forms magnified immages of very small

The process of an unbalanced electric change becoming balanced

A material Through which electrons cannot easily move

A closed or complete path in which on eldctric current flows