A torch bulb is rated 2.5 v and 750ma

Asked by admin @ in Science viewed by 245 People

A torch bulb is rated 2.5 V and 750 mA. Calculate (i) its power (ii) its resistance and (iii) the energy consumed if this bulb is lighted for 4 hours.. Pls giv direct sol..

Answered by admin @


Given :
V=2.5 V
I=750mA= 750x10⁻³A
power =p=?
Power =V*I           
  =2.5x750x10⁻³
=1.875W
reistance :
V=IR
R=V/I=2.5/750x10⁻³=3.3 ohms
Energy consumed if bulb is lighted for 4 hours :
E=p*t=1.875x4=7.500Wh=27x 10³ joules

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