ALTERNATING CURRENT AND VOLTAGE 



13 



add it vectorially to the second vector. For example, in Fig. 9 



^ired to subtract 7-'-j from F\. Ft is reversed giving F 2 . 



F'o, the vector sum of Fi and ^2, found by completing the paral- 



lelogram, i- -Mjual toFi F^ Vectors may be subtracted by the 



triangle method as shown in Fig. 9 (d). The vector F' , connect - 

 be ends of the two vectors FI and F 2 whose difference is 

 desired, is t heir vector difference. 



(a) Sum of two vectors by parallelogram ( ) Sum of two vectors by 

 method triangle method 



(d) Difference of two vectors 

 by triangle method 



Difference of two vectors by parallelogram 

 method 



(c) Sum and difference of two vectors 



'.ml 'lifTrrvnrr of two vectors. 



l;ir:il]rlnm;un. T'iu. !) (e) t having vectors /', and F, as 

 one <lia^nu;d /'',, <>f the |>:irallelo- 

 ^|-;iiii i> I In- VOCtOl I The other diagonal / 



the |):ir:illcl(pjr;iiii, i> the \ ,! of ,h ij,n nrc of /', :md /' . 



indn .it* d by placing a dot under its symbol. 



i.ple, in I'liis. (ai ;ind '.) (6) 

 F l -f I 



