Can you convert watts into kilocalories?

Question

I'm trying to figure out how many kilocalories it would involve to keep a 75 watt lightbulb lit up for 30 years.

Answer 1

no, apples and oranges.

you have to convert to calories per second.

one watt equals 0.2390585 cal/sec.

patrick

Answer 2

1 watt = 0.2390585 calorie/second

So you need to produce 313.8 calories/sec to light a 75 watt lightbulb.

Use this:  http://www.caloriesperhour.com/ to figure out what activities you can do to expend the calories.

If you check this table:  http://www.nutristrategy.com/activitylis...

You will see that running 10 mph in 6 minutes would be more than enough to light up 3 bulbs.

Answer 3

You cannot convert watt into calories, since the former is a measure of power and the later, a unit of energy. Energy is power for a certain time.

75 watt light-bulb for 30 years is 71 gigajoules (or 19.7 megawatt-hour).

1 calorie is 4.184 J, so 16970 kilocalories is the energy that light-bulb would use in 30 years.