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The bulb's power, 75 watts, is the power it uses continuously all the time it is switched on.

The energy it uses can be measured in watt-seconds (Joules) or in watt-hours. A 75 watt bulb uses 75 watt-hours each hour, which is 0.075 kilowatt-hour.

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Wiki User

12y ago
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A 75 watt bulb uses 75 watts of power per hour. The unit of power is already per hour, so there is no need to multiply by hours separately.

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AnswerBot

10mo ago
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75 watts * 1 hour = 270 kilojoules (standard SI unit of energy)

However electrical energy is general measured in kilowatt*hours (kWh) which is obviously 0.075 kWh

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Wiki User

16y ago
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Power is expressed in watts, therefore, 75 watts.

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Wiki User

15y ago
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Q: How many watts per hour does 75 watt bulb use?
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