An electric heater rated as 500watt operates 10 hrs per day..find the cost of operating device for 30 days at ₹4 per kwh

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Solution

Working hrs per day =10

Total working hrs for 30 days = 30 × 10= 300 hours

Energy = Power × Time
= 500 W × 300 h
= 150 kWh

Cost = 150 kWh × ₹4.00 / kWh
= ₹600

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