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
