Question

In May you used 400 ​kilowatt-hours of energy for electricity.

a. Calculate the total electrical energy use in joules.
b. Calculate your average power use in watts.
c. Assume that your power supplier generates electricity by burning oil.
Note that 1 liter of oil releases 12 million joules of energy. How much oil is needed to generate the electricity you​ use?

Give your answer in both liters and gallons.

a. The total electrical energy use was
nothing _ joules.
​(Type an integer or a​ decimal.)
b. The average power use is
nothing _ watts.
​(Round to the nearest whole number as​ needed.)
c. To generate the electricity you​ used,
nothing _ L is needed.
​(Round to the nearest whole number as​ needed.)
To generate the electricity you​ used,
nothing _ gal is needed.
​(Round to two decimal places as​ needed.)

Answer 1

Answer: a)Energy used in may in joules in month of May is 1,440,000,000 Joules.

b) Average power use in watts is month of May is 538 watts.

c)Oil needed to generate the electricity we​ use in month of May liter is 12 L or 3.17 gal

Step-by-step explanation:

Energy used in may = 400 kilowatt-hour = 400,000 watt-hour

1 hour = 3600 seconds

1 joule = Watt × seconds

a) Energy used in may in joules :

400,000 watt-hour=$400,000 watts\times 3600 seconds=1,440,000,000 Joules=1.44\times 10^{9} Joules$

Energy used in may in joules in month of May is 1,440,000,000 Joules .

b) Average power use in watts.

Time = 2,678,400 seconds

( May = 31 days,1 day = 24 hours,1 hour = 3600 seconds)

$Power=\frac{Energy}{Time}=\frac{1.44\times 10^{9} Joules}{2,678,400 seconds}=537.63 watts\approx 538 watts$

Average power use in watts is month of May is 538 watts.

c) Oil needed to generate the electricity we​ use

$12\times 10^6 Joules$  of energy is generated 1 Liter of oil

Then $1.44\times 10^{9} Joules$ of energy will be generated by:

$\frac{1}{12\times 10^6 Joules}\times 1.44\times 10^{9} Joules=120 L$ of oil

1 Liter = 0.264172 gal

12 liter of oil = $12\times 0.264172 gal=3.170064 gal\approx 3.17 gal$

Oil needed to generate the electricity we​ use in month of May liter is 12 L.

Oil needed to generate the electricity we​ use in month of May gallons is 3.17 gal

Answer 2

Answer:

a.) 1,440,000,000 Joules

b.) 538 watts.

c.) 120 L or 31.70 gal

Step-by-step explanation:

Energy used in may = 400 kilowatt-hour = 400,000 watt-hour

1 hour = 3600 seconds

1 joule = Watt × seconds

a) Energy used in may in joules :

400,000 watt-hour=

Energy used in may in joules in month of May is 1,440,000,000 Joules .

b) Average power use in watts.

Time = 2,678,400 seconds

( May = 31 days,1 day = 24 hours,1 hour = 3600 seconds)

Average power use in watts in month of May is 538 watts.

c) Oil needed to generate the electricity used

**NB**

1 Liter of oil realeses 12 million joules of energy

Since

1 Liter = 0.264172 gal

1440000000÷12000000

Therefore the oil needed to generate the energy needed for the month is;

120 litres of oil

120 × 0.264172 = 31.70 gal.

I hope these helps, please give brainliest if it does