A torch bulb is rated $5\, V$ and $500\,mA.$ Calculate its $(i)$ power $(ii)$ resistance and $(iii)$ energy consumed when it is lighted for $4$ hours.
A torch bulb is rated $5\, V$ and $500\,mA.$ Calculate its $(i)$ power $(ii)$ resistance and $(iii)$ energy consumed when it is lighted for $4$ hours.
Given $V=5 V , I =500 mA =0.5 A , P =?, R =?$ and $W =?$
$(i)$ $P = V I =5 \times 0.5=2.5 W$
$(ii)$ $R=V / I=5 / 0.5=10 \Omega$
$(iii)$ $W=P \times t=25 \times 4 h$
$=2.5 \times(4 \times 3600 s )=36000 J$
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