the specification says:

output: 19V 4.74A 120W

input: 100-240V 50/60Hz

where does that 120W come from? 19*4.74 = 90.06

does the 120W mean that if my laptop where to operate at full power it would be using 120W?

if i only chek out the internet how much watts will i be using?

thankx

this is the laptop: ASUS G51Jx

LINK:http://usa.asus.com/product.aspx?P_ID=bplbQOy6w8my...