Question

in 12 hours. how much heat energy does the incandescent bulb give off?
please help me with this question....@geny55

Answer 1

You need to provide the power rating of the bulb i.e., the wattage.

Answer 2

an Incandescent light bulb has a power of 60 W and an efficiency of 1.7%.

Answer 3

I assume the efficiency is the amount of the power used to produce light . so the percentage of the power for heat production is 100%-1.76% = 98.4%. So the amount of power for heat production is
60x.894 = 58.9 watts.

Now 1 watt is 1 joule/second.
and

energy = power rating x time = 58.9joules/sec x 12 hrs x 3600 sec/hr= ?

to put this in perspective 1 joule = .2389 calories
and 1 calorie will raise the temperature of 1 gram of water 1 deg C.

So how much can you raise the temperature of 5 gal. (3.7 L) of water?

I did the math and its about 33 deg C.