A torch bulb is rated 5v and 500ma
Asked by admin @ in Science viewed by 297 People
A torch bulb is rated 5v and 500mA calculate its 1)power 2) resistance 3) energy consumed when it is lighted for 4 hours
Answered by admin @
Given :
Potential difference =V=5V
Current =I= 500mA=500x/1000 A=0.5 A
I) Power = V X I
= 5x0.5 =5x5/10=2.5 W
II)Reistance =R=?
By Ohm's law: V=IR
R=V/I
R=5/0.5
=50/5 =10 ohms
III)Energy consumed when it is lighted for 4 hours
Energy =Power x time
t=4hrs=4x60x60
=2.5x 4x60x60
=36000joules/sec
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