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Answer :
We know that, \( P \ = \ \frac{W}{T} \)
Where,
Power rating of the device(P)
= 500 W
= 0.50 KW
T= 10 hrs,
Work done
= energy consumed × Time
= 0.50 × 10 = 5 kWh
Hence, the energy consumed by four equal rating devices in
10 h = 4 × 5 kWh = 20 kWh = 20 Units.