An electric lamp is marked $100 \,W , 220\, V$. It is used for $5$ hours daily. Calculate : $(i)$ its resistance while glowing. $(ii)$ energy consumed in $kWh$ per day.
An electric lamp is marked $100 \,W , 220\, V$. It is used for $5$ hours daily. Calculate : $(i)$ its resistance while glowing. $(ii)$ energy consumed in $kWh$ per day.
$(i)$ $R =\frac{ V ^{2}}{ P }=\frac{(220)^{2}}{100}=484 \Omega$
$(ii)$ $E = P \times t=100 W \times 5 h =500 Wh =0.5 kW h$
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