2016 engineering hsc help (1 Viewer)

[cloud edwards]

How does one do this?
13) A 240 V, 75 W light globe is replaced with a 240 V, 12 W LED globe of equivalent
brightness.
What is the theoretical power saving?
(A) 12 W
(B) 63 W
(C) 87 W
(D) 240 W

ANSWER: B

 

[Eluate]

75-12=63 done
voltage irrelevant

 

[cloud edwards]

Don't worry figured it was 75-12=63 =B