Alightbulb has a power of 100 w and is used for 4 hours. a microwave has a power of 1200 w and is used for 5 minutes. how much energy is used by the lightbulb? how much energy is used by the microwave? the lightbulb has an efficiency of 1.8%. how much heat energy does the lightbulb produce in 4 hours?

a. E=1440KJ

b. E=360KJ

c. E=1.8 J

Explanation:

I have the power (Watts) is expressed as Energy (Joules) / Time (seconds), also I have to

so, for the lightbulb

Analogously, for the microwave

Now, I have to express the efficiency as Heat energy / power * 100 so

Done

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a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015