Q3 Humanity used 160,000 Terawatt-hours of energy in 2015. If there are 7.4 billion people on earth and 8766 hours per year, how many Watts did each person use on average?
Answers
Given:
Energy used by humanity in the year 2015 = 160,000 Terawatt-hours
∵ 1 Terawatt = 10¹² Watt
∴ 160,000 Terawatt-hours = 160,000 × 10¹² Watt-hours = 16 × 10¹⁶ Watt-hours = 1.6 × 10¹⁷ Watt-hours
No. of people on earth = 7.4 billion = 7.4 × 10⁹
No. of hours per year = 8766
To find:
Watts i.e., power used by each person on an average
Solution:
We have the total watt-hours a year and no. of hours in a year, by dividing we will get the utilization of power in a year.
∴ Power used in a year is,
=
=
= 1.825 × 10⁻⁴ × 10¹⁷ Watts
= 1.825 × 10¹³ Watts
Now, we have to find how much power is used by each person on an average, which we will get by the following calculations:
∴ Power used by each person on an average is,
=
=
= 0.2466 × 10⁽¹³⁻⁹⁾
= 0.2466 × 10⁴
= 2466 Watts
Thus, each person used 2466 Watts on an average.
----------------------------------------------------------------------------------------------
Also View:
An electric refrigerator rated 400 watt operated 8 hour per day what is the cost of energy to be operated it for 30 days at the rate of 3 per kilowatt hour?
https://brainly.in/question/3178349
If a house having 4 tube light each of 40 watts and 2 fans of 100 watts how much electricity consumed in 1 month if they are used for 8 hours per day. Also calculate the electric bill the cost of 1 unit being Rs.08?
https://brainly.in/question/9094518
An rerefrigerator having a power rating of 350 watts operated for 10 hours a day.calculate the electrical energy to operater it for a month 30days .the rate of electric energy is₹3.4 per/kmh.
https://brainly.in/question/14486702