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The world consumes energy at the rate of about $466 EJ$ per year, where the joule$(J)$ is the SI energy unit. I'm having trouble understanding this problem. Can someone please explain me in detail the way to solve this problem. First of all I do not know what the unit $EJ$ represents, is it $exajoule$? |
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Seems that $\text{EJ}$ refers to exajoule, which is ${10}^{18}$ joules, according to Wikipedia...so we have $$466 \;\text{EJ} = (466 \times {10}^{18}) \;\text{J/yr}$$ and this converts to $$\frac{(466 \times {10}^{18}) \;\text{J}} {1 \;\text{yr}} = \frac{(466 \times {10}^{18}) } {1 \times 365 \times 24 \times 60 \times 60}\; \text{W}$$ because 1 year has 365 days, 1 day has 24 hours, 1 hour has 60 minutes and 1 minute has 60 seconds. Do the division and you'll get ${1.47} \times {10}^{13} \;\text{W}$ for the world population. The question asked for per-capita consumption. Hence, I'd assume the population is now 7 billion or $7 \times {10}^{9}$. So continuing the calculation, we have $$\frac{{1.47} \times {10}^{13} \text{W}} {7 \times {10}^{9} \text{people} } = 2100 \text { W / person}$$ |
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2100 w / person. If my neighbour eats two apples per day and i do not; that makes one apple per day each. Now we should kwow what the consumption is in the USA per-capita and then in Tanzania per-capita or in most of African countries where so many people do not still have electricity. |
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