Couple of Questions (1 Viewer)

[Shoom]

Calculate the resistance of a 100W light globe connected to a mains voltage of 240v

Calculate the energy consumption in kilowatt-hours if the 100w globe is on for 10minutes. PLEASE SHOW ALL WORKING.

Thanks

 

[jockrussell]

r=v/i

p=vi
100=ix240
i=100/240
i=5/12

r=v/i
r=240/5/12
r=576 ohms

energy = vit
energy=240x5/12x10/60
energy=16.666w/h
energy in kwh divide by 1000
energy = .o166666kw/h