Slope Dude
A _________ converts mechanical energy into electrical energy. (Creates electricity from movement)
Generator
Formed from the decomposition of prehistoric plants and animals
Fossil fuels
Oil, natural gas and coal are examples of this type of resource
Non-renewable resource
Type of electrical current that flows in only one direction
Direct current or DC
A machine that used the flow of a fluid sun as steam, water or air to rotate a shaft.
Turbine
Wind energy, tidal energy, solar energy, geothermal energy, biomass are all examples of ......
renewable resources
You use a blender to make a fruit smoothie. The input energy is __________ and the output energy is ____________
Input-electrical energy
Output-mechanical energy
Type of energy where heat from the Earth's core is used to generate electricity.
Geothermal energy
This device can convert thermal energy to electrical energy. (Opposite of what an oven does)
Thermocouple
A ________ converts electrical energy into mechanical energy
Motor
This is made by winding a current-carrying wire around a metal core
Electromagnet
Energy can only be transformed from one form to another. It cannot be created or destroyed.
Law of conservation of energy.
In an electric motor, a ____________ is a split ring that breaks the flow of electricity for a moment and reverses it
The rate at which a device converts energy, measured in watts
Power
These devices can change the amount of voltage with hardly any energy loss. They can increase voltage or decrease it.
Transformer
Type of current used in household circuits that flows back and forth 60 times per second
Alternating current or AC
Rotating shaft and coil in a motor or generator
Armature
The ___________ of a device is the ratio of useful energy that comes out of a device to the total energy that went in.
efficiency
Nicolas Copernicus proposed this model to explain the motion of the planets
Heliocentric model
The mechanism that makes electrical contact with the moving commutator in a motor
Brush
Aristotle proposed this model to describe motion of the planets
Geocentric or Earth-centered model
What was Kepler's major contribution to the theories about planetary motion?
Kepler discovered that the orbits of the planets were elliptical and not circular. (Egg-shaped or oval)
Massive coils of wire rotating in huge ____________ provide enough electricity to power whole cities.
Generators
The distance light travels in one year
What is the unit used to measure local distances, or those inside our solar system?
Astronomical unit