If a $2\, kW$ boiler is used everyday for $1$ hour, then electrical energy consumed by boiler in thirty days is .......... $uint$
A$15$
B$60$
C$120$
D$240$
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B$60$
b Energy $ = P \times t = 2 × 1 × 30 = 60\, kWH = 60\,unit$
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