Energy Basics
What kind of energy is stored in food and converted to motion when you walk?
Chemical energy to kinetic energy
In a flashlight, what kind of input energy is present?
Chemical energy from the battery
What did Michael Faraday discover in the early 1800s?
Electromagnetic induction
What is the most common resource used for power plants in Alberta?
Coal
What is efficiency expressed as?
A percentage
Would life exist on Earth without the Sun’s energy?
No, because all energy on Earth originates from the Sun
What kind of output energy is present in a flashlight?
Light and thermal energy
What is the unit for energy?
Joule (J)
What source generates the largest percentage of electricity in Canada?
Hydro
Which light bulbs are more efficient: incandescent or compact fluorescent?
Compact fluorescent
What does the Law of Conservation of Energy state?
Energy cannot be created or destroyed, only transformed
What are the three components necessary for energy conversion?
Energy source, converter, and load
How can you increase the amount of electrical energy produced in a generator?
Increase the speed of movement or strength of the magnetic field
What type of energy is moving water that spins a turbine?
Kinetic energy
If 15 kJ of energy output occurs after an input of 55 kJ, what is the efficiency?
27.27%
What kind of energy does a skier have at the top of a hill?
Potential energy
What energy does a ski racer have as she crosses the finish line?
Kinetic energy
If a chainsaw uses 4000 J in 180 seconds, how much power does it use?
22.22 W
What energy converter is common to power plants fueled by hydro, coal, and natural gas?
Turbine
List three ways energy can be conserved in a home.
Use LED bulbs, unplug devices, insulate windows, etc.
What is the origin of the input energy for all electricity generation plants?
The Sun, as it powers wind, water cycles, and fossil fuel formation
Identify one useful energy and one waste energy for the combustion of gasoline in a car.
Useful = kinetic energy, Waste = thermal energy
A machine uses 5000 W in three hours. How much energy was used?
15,000 Wh or 15 kWh
In a thermonuclear generation station, what process produces thermal energy?
Nuclear fission
If a car engine receives 200 kJ of energy from fuel but only 50 kJ is used for motion, what is its efficiency?
25%