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Named after the English physicist James Prescott Joule, the joule is a unit of energy in the International System of Units. A single joule represents the energy transferred when a force of one newton acts over a meter. To put it in everyday terms, the energy used to lift a small apple one meter off the ground is approximately one joule. Interestingly, the joule is also the energy released in one second by a current of one ampere through a resistance of one ohm, showcasing its versatility across both mechanical and electrical domains.

While joules measure energy, they can also power curiosity. For instance, the daily recommended caloric intake for an average adult translates to roughly 8,700,000 joules. This highlights the joule’s role not only in physics but also in our nutrition and daily energy consumption, offering a glimpse into the complex interplay between energy, food, and our bodies.

Did you know?

The calorie, commonly associated with food energy, originally measured heat in physics. One calorie is the amount of heat needed to raise the temperature of 1 gram of water by 1 degree Celsius. Despite what food packaging might suggest, when we count calories, we are typically referring to kilocalories, which equals 1,000 of these small calories. This means that when you see a snack label stating it’s 100 calories, it’s actually 100 kilocalories, or 100,000 calories in scientific terms!

Interestingly, the calorie became a popular unit due to its early use in nutrition studies and its role in determining food’s energy content. This is crucial, as it helps in planning and maintaining balanced diets and understanding energy expenditure for health and fitness.

> Joules to Calories Conversion Table

Joules Calories
0 J 0 cal
100 J 23.90057 cal
200 J 47.80115 cal
300 J 71.70172 cal
400 J 95.60229 cal
500 J 119.50287 cal
600 J 143.40344 cal
700 J 167.30402 cal
800 J 191.20459 cal
900 J 215.10516 cal
1000 J 239.00574 cal
1100 J 262.90631 cal
1200 J 286.80688 cal
1300 J 310.70746 cal
1400 J 334.60803 cal
1500 J 358.5086 cal
1600 J 382.40918 cal
1700 J 406.30975 cal
1800 J 430.21033 cal
1900 J 454.1109 cal
2000 J 478.01147 cal
2100 J 501.91205 cal
2200 J 525.81262 cal
2300 J 549.71319 cal
2400 J 573.61377 cal
2500 J 597.51434 cal
2600 J 621.41491 cal
2700 J 645.31549 cal
2800 J 669.21606 cal
2900 J 693.11663 cal
3000 J 717.01721 cal
3100 J 740.91778 cal
3200 J 764.81836 cal
3300 J 788.71893 cal
3400 J 812.6195 cal
3500 J 836.52008 cal
3600 J 860.42065 cal
3700 J 884.32122 cal
3800 J 908.2218 cal
3900 J 932.12237 cal
4000 J 956.02294 cal
4100 J 979.92352 cal
4200 J 1003.82409 cal
4300 J 1027.72467 cal
4400 J 1051.62524 cal
4500 J 1075.52581 cal
4600 J 1099.42639 cal
4700 J 1123.32696 cal
4800 J 1147.22753 cal
4900 J 1171.12811 cal
5000 J 1195.02868 cal
5100 J 1218.92925 cal
5200 J 1242.82983 cal
5300 J 1266.7304 cal
5400 J 1290.63098 cal
5500 J 1314.53155 cal
5600 J 1338.43212 cal
5700 J 1362.3327 cal
5800 J 1386.23327 cal
5900 J 1410.13384 cal
6000 J 1434.03442 cal
6100 J 1457.93499 cal
6200 J 1481.83556 cal
6300 J 1505.73614 cal
6400 J 1529.63671 cal
6500 J 1553.53728 cal
6600 J 1577.43786 cal
6700 J 1601.33843 cal
6800 J 1625.23901 cal
6900 J 1649.13958 cal
7000 J 1673.04015 cal
7100 J 1696.94073 cal
7200 J 1720.8413 cal
7300 J 1744.74187 cal
7400 J 1768.64245 cal
7500 J 1792.54302 cal
7600 J 1816.44359 cal
7700 J 1840.34417 cal
7800 J 1864.24474 cal
7900 J 1888.14532 cal
8000 J 1912.04589 cal
8100 J 1935.94646 cal
8200 J 1959.84704 cal
8300 J 1983.74761 cal
8400 J 2007.64818 cal
8500 J 2031.54876 cal
8600 J 2055.44933 cal
8700 J 2079.3499 cal
8800 J 2103.25048 cal
8900 J 2127.15105 cal
9000 J 2151.05163 cal
9100 J 2174.9522 cal
9200 J 2198.85277 cal
9300 J 2222.75335 cal
9400 J 2246.65392 cal
9500 J 2270.55449 cal
9600 J 2294.45507 cal
9700 J 2318.35564 cal
9800 J 2342.25621 cal
9900 J 2366.15679 cal
10000 J 2390.05736 cal