答案:To convey general concepts such as light, color, ray, wheel, axis, etc., which can be used in a variety of registers.#To convey concepts in a specific field, such as circuit, wavelength, frequency, capacitor, etc. in electronics.#To convey concepts in a general field, such as electricity, power, force, optics, etc. in physics.#To refer to objects concerned in scientific register, such as lens, vessel, beaker, etc.