3 multiple choice science questions, help please.?

Question

If you could help me out with any of these that would be awesome.

1. The source of all electrical energy is:

A) rivers

B) generators

C) coal

D) wind

E) the sun

2. The cost of operating a 1200 W stereo for 6 hours at 17 cents/k Wh would be about:

A) $0.90

B) $1.22

C) $73.61

D) none of these

3. The type of energy in coal is:

A) solar

B) thermal

C) chemical

D) mechanical

Thanks guys

Answer 1

Q1= The sun

Q2=1.22 dollars

Q3=B

Answer 2

1.e

2.b

3.b

Answer 3

number one is "E"

2.idk....

3.A

Answer 4

1. B

2. D

3. C

Answer 5

1. is somewhat ambiguous.  Generators are what generate the electricity we use in our homes, except in areas where the grid can be supplemented by renewable energy like solar and wind.

2. B (1200 watts = 1.2 kilowatts -> $0.17/kWh x 1.2 kW x 6 hours = $1.22)

3. C - it's the chemical bonds in coal being broken as it's burned that release the energy that heats water, turns a turnbine, and generates electricity.