The human brain consumes about 22 W of power under normal conditions, though more power may be consumed during exams. (a) For what amount of time can one Snickers bar ([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 cal = 1 kcal = 4184 J.]) power the normally functioning brain? (b) At what rate must you lift a 3.6 kg. container of milk ( one gallon) if the power output of your arm  is to be 22 W? (c) How much time does it take to lift the milk container through a distance of 1.0 m at this rate?

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.