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A megajoule is 1/3.6 of a kilowatt-hour so it costs about $0.05.
This gives the energy output in joules. 0.1 watt x 10 seconds equals 1 joule of electrical energy. 1  As joules are small units, and because appliances commonly use watts, milliwatts, and kilowatts to indicate how much power they use, utilities commonly measure their energy output in kilowatt-hours.o find out how much energy a 60W light bulb consumes in 120 seconds, simply multiply (60 watts) x (120 seconds) = 7200 Joules. 1  This formula works for any form of power measured in watts, but electricity is the most common application.