Twa kɔ nsɛm atitiriw so

Sign up for FREE

4.08 Nova Energy Lab Part 1

Last updated about 1 month ago

31 Nsɛmmisa

Question 1

00:51

Ɛhia

0.5

Question 2

01:20

Ɛhia

0.5

Question 3

02:20

Ɛhia

0.5

Question 4

00:56

Ɛhia

0.5

Question 5

01:10

Ɛhia

0.5

Question 6

01:50

Ɛhia

0.5

Question 7

00:29

Ɛhia

0.5

Question 8

01:08

Ɛhia

0.5

Question 9

01:49

Ɛhia

0.5

Question 10

02:03

Ɛhia

0.5

Question 11

02:43

Ɛhia

0.5

Question 12

01:26

Ɛhia

0.25

Asemmisa {{asɛmmisaAhyɛnsode}}

12.

What is the basic mechanism by which most photovoltaic (PV) cells generate electricity?

Photons from sunlight excite electrons in semiconductor material, creating an electric current.

Heat from the Sun causes water to evaporate, which then drives turbines connected to generators.

Magnetic fields generated by solar radiation push charged particles through copper wire coils.

Question 13

02:40

Ɛhia

0.25

Question 14

00:58

Ɛhia

0.5

Question 15

01:29

Ɛhia

0.5

Question 16

01:53

Ɛhia

0.5

Question 17

02:09

Ɛhia

0.5

Question 18

02:31

Ɛhia

0.5

Question 19

00:30

Ɛhia

0.5

Question 20

01:56

Ɛhia

0.5

Question 21

02:39

Ɛhia

0.5

Question 22

03:36

Ɛhia

0.5

Question 23

00:42

Ɛhia

0.5

Question 24

01:17

Ɛhia

0.5

Question 25

02:49

Ɛhia

0.5

Question 26

01:14

Ɛhia

0.5

Question 27

01:47

Ɛhia

0.5

Question 28

02:21

Ɛhia

0.5

Question 29

01:09

Ɛhia

0.5

Question 30

01:46

Ɛhia

0.5

Question 31

02:38

Ɛhia

0.5

Asemmisa {{asɛmmisaAhyɛnsode}}

1.

How much of current energy use comes from coal, oil, and natural gas?

~80%

~100%

~50%

Asemmisa {{asɛmmisaAhyɛnsode}}

2.

Which of the following is NOT a major concern of burning fossil fuels?

They are being used faster than they are being created.

They are the only energy source available.

They release large amounts of carbon dioxide that affect climate.

Asemmisa {{asɛmmisaAhyɛnsode}}

3.

What is the best hope for a sustainable future?

Stopping all energy use immediately

Relying solely on current fossil fuel reserves

Developing alternative energy sources and innovative technologies

Asemmisa {{asɛmmisaAhyɛnsode}}

4.

What type of energy is stored in wood, oil, coal, and natural gas?

Kinetic

Potential

Chemical

Asemmisa {{asɛmmisaAhyɛnsode}}

5.

What forms of energy is the chemical energy stored in fuels converted to?

Gravitational, elastic, and sound

Thermal, mechanical, and electrical

Nuclear, radiant, and chemical

Asemmisa {{asɛmmisaAhyɛnsode}}

6.

What role does a turbine play in an electrical generator system?

It converts electrical energy into motion.

Its spinning causes electrons to be pushed through wires.

It stores chemical energy for later use.

Asemmisa {{asɛmmisaAhyɛnsode}}

7.

How were fossil fuels formed?

From decaying prehistoric plants and animals buried underground

From the gradual cooling of Earth's crust

From volcanic eruptions over millions of years

Asemmisa {{asɛmmisaAhyɛnsode}}

8.

What is a renewable energy source?

Energy produced only from the Sun's light

Energy so plentiful it is effectively limitless for humankind

Energy that can be recycled after use

Asemmisa {{asɛmmisaAhyɛnsode}}

9.

Which energy source collects the Sun’s energy directly in the form of light or heat?

Solar

Tidal

Hydroelectric

Asemmisa {{asɛmmisaAhyɛnsode}}

10.

How do wind, hydroelectric, and biomass use the Sun’s energy indirectly?

Kinetic energy of flowing air and water and the chemical energy of plants

Gravitational forces between the Sun and Earth

Earth's core thermal energy

Asemmisa {{asɛmmisaAhyɛnsode}}

11.

Besides the Sun, which two energy sources does the video name as plentiful enough to be considered renewable?

Geothermal and tidal energy

Nuclear and hydrogen

Coal and oil

Asemmisa {{asɛmmisaAhyɛnsode}}

13.

Why hasn't solar energy completely replaced fossil fuels?

Greenhouse gas emissions

Sunlight availability

Cost, efficiency, and storage issues

Asemmisa {{asɛmmisaAhyɛnsode}}

14.

What part of the turbine produces electricity once the blades rotate?

The blade tips

The generator inside the turbine

The tower foundation

Asemmisa {{asɛmmisaAhyɛnsode}}

15.

What is the main challenge to wider wind power use?

Wind does not always blow in the same place or time

Wind turbines emit large amounts of greenhouse gases

Wind turbines cannot be connected to grids

Asemmisa {{asɛmmisaAhyɛnsode}}

16.

Why is location a limiting factor for wind farms?

It is dangerous to put wind farms too close to cities

There are very few sites with enough wind to move the turbine blades

Windy sites are often far from cities where demand is highest

Asemmisa {{asɛmmisaAhyɛnsode}}

17.

Which of the following is true regarding the costs of wind farms?

They cost nothing to build or operate

They are very expensive to build and operate

They are relatively cheap to operate but expensive to build

Asemmisa {{asɛmmisaAhyɛnsode}}

18.

What would help wind power become cheaper and easier to use?

Making the turbine blades larger

Finding better ways to store the electricity it generates

Eliminating transmission lines

Asemmisa {{asɛmmisaAhyɛnsode}}

19.

What is the primary source of geothermal energy?

The greenhouse effect in the atmosphere

Heat from the Earth's interior warming underground water

Heat from the sun stored at the surface

Asemmisa {{asɛmmisaAhyɛnsode}}

20.

In geothermal energy production, what spins the turbine that powers the generator?

Steam/vapor

Hot water

Magma

Asemmisa {{asɛmmisaAhyɛnsode}}

21.

What is the environmental benefit of geothermal energy?

High emissions and fossil fuel use

Inexpensive and easy to access

Low emissions and minimal environmental impact

Asemmisa {{asɛmmisaAhyɛnsode}}

22.

How are byproducts from geothermal energy handled?

Byproducts are re-injected underground; minerals can be removed and sold

Byproducts are processed into fuel; organic matter is composted and sold

Byproducts are dumped in oceans; radioactive materials are extracted and sold

Asemmisa {{asɛmmisaAhyɛnsode}}

23.

What is biomass?

Inorganic materials like plastics

Organic materials such as plants, trees, and algae

Fossil fuels like coal and oil

Asemmisa {{asɛmmisaAhyɛnsode}}

24.

What is an advantage of many biofuels?

They can be made from synthetic chemicals

They can be made from extracted minerals

They can be made from leftovers or waste products.

Asemmisa {{asɛmmisaAhyɛnsode}}

25.

How do researchers aim to reduce the cost of producing biofuel?

By banning conventional fuels and converting existing systems to biofuels

By developing sustainable biomass resources and more effective enzymes, organisms, and catalysts

By placing high taxes on fossil fuels

Asemmisa {{asɛmmisaAhyɛnsode}}

26.

What happens to unused energy produced by solar and wind?

Easily converted to fossil fuels

Stored directly in the power grid

Lost if not captured or stored by other means

Asemmisa {{asɛmmisaAhyɛnsode}}

27.

Which storage method is one of the most likely solutions?

Storing electricity as chemical energy inside giant batteries

Storing electricity as thermal energy in molten metals

Converting electricity into gravitational potential energy by pumping water up hills

Asemmisa {{asɛmmisaAhyɛnsode}}

28.

Why would better energy storage allow greater reliance on renewables?

Because storage would let excess renewable electricity be used during high demand

Because storage would allow renewables to produce nonstop

Because storage makes fossil fuels more efficient than renewables

Asemmisa {{asɛmmisaAhyɛnsode}}

29.

What could happen if no upgrade is made to the grid as demand increases?

Power plants will stop producing energy.

Blackouts could become a regular occurrence.

People will stop wanting to use electricity.

Asemmisa {{asɛmmisaAhyɛnsode}}

30.

How would a smart grid help prevent blackouts?

By placing sensors and controls so operators learn about problems immediately.

By re-routing electricity around problem areas automatically.

By increasing the number of power plants and power lines.

Asemmisa {{asɛmmisaAhyɛnsode}}

31.

How could smart technologies make the grid more efficient?

Charging customers a flat fee for all electricity regardless of demand.

Increasing overall energy production regardless of demand.

Allowing better control of when and where electricity is used to balance demand.