Brain Power The human brain consumes about 22 W of power under normal conditions

Question

Brain Power The human brain consumes about 22 W of power under normal conditions, though more power may be required during exams.

How long can one Snickers bar (280 Cal per bar) power the normally functioning brain? [Note: The nutritional calorie, 1 Cal, is equivalent to 1000 calories (1000 cal) as defined in physics. In addition, the conversion factor between calories and joules is as follows: 1 Cal = 1000 calories = 1 kcal = 4186 J]

Express your answer using two significant figures.

Include answer in hours!

Explanation / Answer

Energy= power x time
280x4186 = 22x time
time= 53276 sec
time = 14.8 hours  

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