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الموضوع: Human Power

  1. #1
    عضو مميز الصورة الرمزية ساره
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    Jul 2011
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    افتراضي Human Power


    Human Power

    Human Power

    Human PowerHow much Power do we humans generate going about our daily activities?
    Let's take a man about my size. I weigh about 75 kg (165 pounds) of solid muscle. Okay, stop laughing, there's some fat in there. Anyway someone like me, just sitting around (a good way to add more fat) reading or watching TV (a stupid waste of time compared to reading, if you're determined to add fat), converts about 68 Calories of food energy into heat and bodily functions (pumping blood, breathing, cellular processes, etc.) every hour. That's equal to about 79 Watts of power, just to sit and stay alive. Me and the 75 Watt bulb are both heating up the room at about the same rate (but the light bulb is brightening things up a bit).

    If I get off my duff and start walking briskly, say 3.5 miles per hour, then I am converting about 330 Calories of food energy to motion and thermal energy every hour. That's about 383 Watts of power. Pretty good, huh? Watch the fat melting away. Keep walking every day, and it really will.

    Now, if I really get motivated and start jogging at a pretty good clip, but not quite a full out sprint, I might manage to convert 642 Calories of energy into motion and heat every hour (though it is doubtful I could keep up that pace for an hour). Now I am generating 745 Watts of power, or 745 Newton-meters (Joules) of energy every second. That's almost 1 horsepower! Forget about it. I can't do that.

    Say It Again
    Power is the rate at which energy is converted. Whenever energy changes form, or moves from place to place (heat flow), the rate at which it makes those changes is described as power. If a device converts one Joule of energy every second the Power is 1 Watt. If a device converts one Joule of energy every 10 seconds, the Power is one tenth of a Watt (1 J/10 seconds = 0.1 Watts). If a device converts 1000 Joules of energy every second, the Power is 1000 Joules per second, or 1000 Watts (1 kilowatt).

    The Watt is a unit of Power that is equal to one Joule of energy being converted every second. Power is always some unit of energy (like Joules, foot-pounds, Btu's, calories) divided by some unit of time (like seconds, minutes, hours, or months). One Btu per month is a very small unit of power.

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  2. #2
    عضو ذهبي الصورة الرمزية عزمي الزبن
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    Jul 2011
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    افتراضي رد: Human Power

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  3. #3
    عضو ذهبي الصورة الرمزية أبو مجد
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    افتراضي رد: Human Power

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  4. #4
    عضو مميز الصورة الرمزية قمر بلحاج
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    افتراضي رد: Human Power

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