Unformatted text preview: diagram symbol for an B O resistor is shown in Fig.2.7. Ohm's law expresses the voltage as a function of the current. However, expressing the curcnt as a function of the voltage also is convenient. Thus, frcm Eo.2.1. u = -iR, \2.2) (2.3) 12.4) " = * " \2.5) i l ^ ' l r = i R r = , R Figure 2.6.q Two possibte r€ference choices forthe drrent and vottage atthe ternrinals of a resistor, and 8r} Flgure 2.7 d. The circuit symboLfor an 8 O rcsjstor. :1 or,fromEq.2.2, The reciprocal of the resistance is rcferred to as conductance, is sym-bolized by the letter G, and is measured in siemens (S).Thus An 8 O resjstor has a conductance value of 0.125 S In much of tie profes sional iiterature, the ur t used for conductance is the mho (ohm spelled back-ward), which is symbolized by an inverted omega ((J). Therefore we may also descdbe an 8 O resistor as having a conductance of 0.125 nho, ((')....
View Full Document
- Spring '07
- ohm, Trigraph, Electrical resistance, tie profes sionaliiterature