Energy is also found in food, and measured in joules. How long would you have to plug yourself into the wall to get the same amount of power as a day’s worth of food? Well, the average adult male needs 10 million joules of energy a day. When you consider that your laptop probably charges at a rate of 50 joules a second, you would need to plug yourself in for a whopping 55 hours. But if you were charging yourself at the same rate a microwave does – around 1,500 joules per second – it would only take 1.9 hours. (Source: http://www.sciencealert.com/watch-amazing-energy-facts-to-blow-your-mind)