A $100$ watt electric bulb is lighted for $2$ hours daily. and four $40$ watt bulbs are lighted for $4$ hours everyday. Calculate the energy consumed (in $k W h$ ) in $30$ days.
A $100$ watt electric bulb is lighted for $2$ hours daily. and four $40$ watt bulbs are lighted for $4$ hours everyday. Calculate the energy consumed (in $k W h$ ) in $30$ days.
Energy consumed by $100$ watt bulb working for $2$ hours
$=\frac{100}{1000} kW \times 2$ hour $=0.2 kW h$
Energy consumed by four $40$ watt bulbs working everyday for $4$ hours
$=\frac{40 \times 4 \times 4}{1000} kWh =0.64 kW h$
Total energy consumed everyday
$=(0.20+0.64) kW h =0.84 kW h$
Total energy consumed in $30$ days
$=0.84 kW h \times 30=25.2 kW h$
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