Total annual usage of energy by humankind is in the order of: 1. Mega

1.	Total annual usage of energy by humankind is in the order of: 1. Mega Joules 2. Giga Joules 3. Terra Joules 4. Exa Joules
Answer» Normally , the consumption of energy by a healthy human in a day is 2000 Kcal we know, 1Kcal = 4200 Joules so, consumption of energy by humankind in a day = 2000 × 4200 Joules = 8.4 × 10^⁶ Joules now, 1 annual = 1 year = 365 days so, consumption of energy by humankind in a year = consumption of energy by humankind in a day × 365 days = 8.4 × 10⁶ × 365 Joules = 3066 × 10⁶ Joules = 3.066 × 10⁹ Joules We know, Kilo = 10³ mega = 10⁶ Giga = 10⁹ Terra = 10¹² peta = 10¹⁵ exa = 10¹⁸ So,annual consumption of energy by humankind = 3.066 Giga Joules Hence, annual consumption of energy by humankind is in the order of Giga Joules. Total annual usage of energy by humankind is of the order of Terra Joules

Total annual usage of energy by humankind is in the order of: 1. Mega Joules 2. Giga Joules 3. Terra Joules 4. Exa Joules

Answer»

Normally , the consumption of energy by a healthy human in a day is 2000 Kcal
we know,
1Kcal = 4200 Joules
so, consumption of energy by humankind in a day = 2000 × 4200 Joules
= 8.4 × 10^⁶ Joules

now, 1 annual = 1 year = 365 days
so, consumption of energy by humankind in a year = consumption of energy by humankind in a day × 365 days
= 8.4 × 10⁶ × 365 Joules
= 3066 × 10⁶ Joules
= 3.066 × 10⁹ Joules

We know,
Kilo = 10³
mega = 10⁶
Giga = 10⁹
Terra = 10¹²
peta = 10¹⁵
exa = 10¹⁸

So,annual consumption of energy by humankind = 3.066 Giga Joules
Hence, annual consumption of energy by humankind is in the order of Giga Joules.

Total annual usage of energy by humankind is of the order of Terra Joules

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