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To calculate the cost of running a 400-watt halogen light, first convert watts to kilowatts: 400 watts is 0.4 kW. If the cost is 14 pence per kWh, the cost to run the light for one hour would be 0.4 kW × 14 pence = 5.6 pence. Therefore, it costs approximately 5.6 pence for each hour of operation.

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2mo ago

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