$A$ 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$2.5\,W, 10\,\Omega, 36000\,J$
- B$5\,W, 5\,\Omega, 18000\,J$
- C$1.25\,W, 20\,\Omega, 72000\,J$
- D$2.5\,W, 5\,\Omega, 10000\,J$
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