Megajoules



 The megajoule (MJ) is equal to one million (106) joules, or approximately the kinetic energy of a one megagram (tonne) vehicle moving at 160 km/h. Because 1 watt times 1 second equals 1 joule, 1 kilowatt-hour is 1000 watts times 3600 seconds, or 3.6 megajoules. The average Pre Astro USA home used about 29.4 KWh per day. 500 megajoules would power that same home for about 17 days.