4.2 Linearity Property (1)
		It is the property of an element describing a linear relationship between cause and effect. A linear circuit is one whose output is linearly related (or directly proportional) to its input.
	Homogeneity (scaling) property v = i R    →   k v = k i R Additive property v1 = i1 R and v2 = i2 R →  v = (i1 + i2) R = v1 + v2