Question

Two bulbs of 40w and 60w are connected in parallel find currect energy in 1 ghour

Answer 1

total resistance in parallel=1/r1+1/r2

1/r=1/40+1/60

1/r=3+2/120

1/r=5/120

1/r=1/24

R=24

and time =1hours =60minutes

so, current = 60*24
=1440

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Answer 2

total resistance in parallel=1/r1+1/r2
1/r=1/40+1/60
1/r=3+2/120
1/r=5/120
1/r=1/24
R=24
and time =1hours =60minutes 
so, current = 60*24=1440
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