Batteries
Electrolyte
What is the 1st law of thermodynamics (Conservation of energy)
Energy cannot be created or destroyed only transfer forms
a hair dryer operates on a 120 V outlet and draws 12 A of current, what is the power rating of the hair dryer in Watts
P=VI
1440 W
Solar
Nuclear
Wind
Hydro
Geothermal
What is the scientific definition of work
energy transferred to or from an object through a force along a displacement (movement)
All battery create a difference in what between two electrodes?
Voltage
What is the difference between Voltage and Wattage?
Voltage is an electrical pressure and Wattage is how much energy is used in a certain amount of time (Wattage = Voltage x Amperage)
A window air conditioner has a power rating of 2,000 W and runs for 6 hours
How many kilowatt-hours of energy does the air conditioner use?
12 kWh
What source of energy causes wind to blow around the Earth
What happens to a majority of the energy in thermal generation (Gas engines, Fossil fuel, Nuclear power plants)
What is essential for the two electrodes in a battery to be
What happens when you move magnets around a wire or wire around magnets
Generate an electrical current
A clothes dryer uses 3.5 kWh of electricity for each load of laundry. Electricity costs $0.18 per kWh.
How much does it cost to run one load of laundry?
$0.63
What is a turbine and how does it contribute to generating energy?
Turbine is a fan that is moved by different methods (steam, water, wind) that helps move the wire around magnets/ magnets around wire in an electrical generator
Sun-> Air-> wind Turbine -> Light bulb
Sun-> Plants-> power plant -> light bulb
Any path that makes sense (must have original cause of energy)
What is a pro and con of lead acid batteries
Pros- Low cost, High surge current, reliable, easy to recycle, can be overcharged
Cons- Heavy, limited life cycle, Maintenance required, toxic materials that can spill out, slow to charge
How are electricity and magnetism related
A student is choosing between two desk lamps
Lab A- 40W
Lamp B- 8W
Both lamps run for 4 hours each day
a. How many watt-hours does each lamp use per day?
b. Which lamp uses less energy?
c. How much energy would each lamp use in 30 days (Wh)?
a. 160 Wh, 32 Wh
b. Lamp B
c. 4800 Wh, 960 Wh
What is one major difference between renewable efficiency and non-renewable efficiency?
With non-renewable energy, there is a loss/waste of energy. with renewable it only measures how much energy is captured
What is the positive and negative side a battery called
Anode and cathode
List at least one use for...
Lithium Ion Batteries
Alkaline Batteries
Lead acid batteries
Lithium Ion-Smartphones, Laptops, Headphones, Speakers, Digital Cameras, Smartwatches, EV's, Power Drills
Alkaline- AA, AAA, 9V, D batteries
Lead Acid- Car batteries, TV's, Boats, Snowmobiles, Backup power supplies, Deep cycle batteries
Where do you think we could be more efficient with energy? Do you think we should change the way we generate energy or the way we sue energy. Give at least 3 facts to justify your claim
Answers will vary
Two gaming consoles are used for 3 hours each day
Console A- 180 W
Console B- 120 W
a. Calculate the daily energy use of each console in watt-hours.
b. Convert the answers to kWh.
c. If energy cost $0.19 per kWh and a typical month has 30.5 days, what is the cost difference of the consoles per month?
b. A 0.54 kWh, 0.36 kWh
c. $1.04 per month
What is the best energy source? Give at least 3 pros of your chosen energy source and compare it to at least one other energy source. Explain why your chosen energy source is better
answers will vary
How does a nuclear power plant work (where does the energy come from)