Does thinking hard really burn more calories and leave us drained? Not really, it just feels that way. On an interesting note, the article mentions the average brain burns about 12 watts. According to my energy meter, that’s around the same as an idling laptop, a 40″ LCD in standby, an Xbox360 idling or a low-power table lamp. But yet, so much more powerful.
—Resting metabolic rate: 1300 kilocalories, or kcal, the kind used in nutrition
—1,300 kcal over 24 hours = 54.16 kcal per hour = 15.04 gram calories per second
—15.04 gram calories/sec = 62.93 joules/sec = about 63 watts
—20 percent of 63 watts = 12.6 watts