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a 75 w compact fluorescent bulb operating at 30% efficiency. Calculate the amount of energy lost to heat and the amount of energy converted into light after the bulb has been on for 2.0h.

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2*3600 seconds/h = 7200 seconds

75 * 7200 = 540,000 Joules total electricity use

.7 * 540,000 = heat Joules
.3 * 540,000 = light Joules

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