Marconi Instruments TF 2502 - Page 11

Transposing and simplifying, equation (1) gives
m
Example: From measurements, it is found that
1. 1 Wand Pm = 1. 5 W
Hence from equation (2)
J
2 (1.5 - 1.1) 1 (JJ
m = x. 001o
1.1
85.5%
10
2501 (1)