ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
TABLE 2.—EFFICIENCIES OF SINGLE PHASE 
ALTERNATORS. 
‘ oa 
Average Commercial Efficiency. 
Output of Alternator. 
At Full Load. At Half Load, 
5 KVA. .83 75 
10 re .85 .80 
25 = . 86 .81 
os .88 82 
100 sf .89 .83 
200) 0c? .90 . 84 
po 91 . 85 
500 = -93 .87 
750 ‘ 94 .89 
Tue, 95 91 
\ 
14. Voltage Drop.—tThe voltage drop on alternators at full 
load should be, on an average, about 
7%, with a power factor, cos P 
22%, with a power factor, cos P 
26%, with a power factor, cos P 
= 104 : 
= 0.8; 
== 0:8. 
This is shown graphically in Fig. 5, eurve B. 
% 4o Se a 
iH 
R EN BP ties hh 
Sic ona my 
8 A 
N 10 a 10% 
\ 
Ss 
ae RR G 6 g 1 =cosY, 
LOAD POWER FACTOR . 
Fie. 5.—AVERAGE VALUES OF VOLTAGE Drop FOR DIFFERENT 
POWER FACTORS. 
