egee 101 exam 3

Electricity demand is often highest at what time of day?

middle afternoon

Which of the following is not a challenge with wind and solar power?

non-renewable

which energy sources typically don't fluctuate during power generation?

nuclear and hydro

layers of silicon that directly convert sunlight into an electric current are called what?

photovoltaic cells

the reason hydropower is considered renewable is

the hydrologic cycle

Your typical AA battery produces 0.1 Amperes of current at 1.5 Volts. How much power (Watts) does the battery produce?

.15 watts

if a solar farm generates 10 MW in Arizona (320 sunny days per year) is moved to Pennsylvania (160 sunny days per year), what is the new power output?

5 MW

what proportion of US electricity comes from hydroelectric dams?

6%

What is the main reason that our power grid uses alternating current technology?

AC power is easier to transform to higher/lower voltages

which is bigger?

The total global capacity of all renewable power plants (wind, solar, biomass, geothermal, hydroelectric)

What are the main concerns with nuclear power?

Weapons proliferation, waste disposal, catastrophic accidents

the Chernobyl accident was a nuclear explosion

false

he problem of needing to install large transmission capacity to move electrons from the power generation source to a market is called what?

location problem

the splitting of a larger nucleus into two smaller nuclei

nuclear fission

What piece of equipment is needed to connect a dc power generator to the ac power grid?

rectifier

Which of the following probably produces direct current?

solar photovoltaics

Electricity demand is often highest during which season?

summer

wind is caused by uneven heating of the earth's surface

true

Which of the following probably produces alternating current electricity?

wind turbine gas turbine coal plants (anything with a turbine)

Which energy Conversion do you think Solar photovoltaics take advantage of?

radiation to chemical to electric

the challenge associated with a renewable energy where excess power generation cannot be saved for later use

storage

If a wind turbine extracted 100% of the kinetic energy out of the wind, what would happen?

the wind would stop blowing

nuclear weapons can be converted to nuclear reactors

true

nuclear, wind, solar, and hydropower are all renewable forms of energy

false

What are the three stages of the electricity supply chain?

generation, transmission, and distribution

the sun delivers approximately 10,000 times more energy per second to the earth than the whole world's population uses

true

In an alternating current power system, if the current is increased while keeping power constant, what must happen to voltage?

voltage decreases

watts

voltage x current

the challenge associated with wind energy that fluctuates throughout the day

intermittency

Which energy Conversion do you think Wind turbines take advantage of?

Potential to kinetic to electric Kinetic to kinetic to electric

the challenge associated with wind energy whose power output cannot be forecast in advance

predictability

Which state uses the most solar energy?

california NC arizona

what does the duck curve explain?

The rapid change in power demand from the grid when solar output declines at the end of the day

Alternating current power is based on what physical concept?

The relationship between electricity and magnetism

Can wind and solar power replace coal for US electric generation?

Yes, there is enough unused potential wind power to take over what coal is currently supplying

Nuclear power plants are designed to run 24 hours per day, 7 days per week. What kind of electricity do they provide?

base load

Which of the following probably produces direct current electricity?

battery in phone solar panels

panels that use sunlight to heat up water, spinning a turbine are called what?

concentrated solar

Which of the following strategies is used to smooth variability from wind and solar?

energy storage, interconnecting multiple wind and solar plants

Which of the following is not a challenge with wind and solar energy?

non-renewable

nuclear, wind, solar, and hydropower are all energy forms that do not directly emit carbon dioxide into the atmosphere

true

the consensus of the scientific community is that deep geologic storage of high level radioactive waste is a safe long term solution

true

Which of the following describes the minute to minute variability of wind energy?

turbulence

A 9 volt battery draws 2 amps of current. How much power is produced?

18 watts

Which state uses the most wind energy?

texas Iowa california

Wind energy produced depends on which of the following factors:

turbine height, wind speeds, size of the blades

Which describes a main difference between solar and wind?

wind turbines tend to produce more at night, while solar panels to produce more during the day