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Answer :
We know that, \( P \ = \ \frac{W}{T} \)
Where,
Power rating of the heater,(P) = 1500 W = 1.5 KW
T = 10 hrs, \(\space \)
Work done = Energy consumed by the heater
\(\therefore energy \ consumed \ = \ Power \ × \ Time \)
\(\Rightarrow 1.5 \ × \ 10 \ = \ 15 \ kWh \)
Hence, the energy consumed by the heater in 10 hrs is 15 kWh.