Electrical Principles: Topic 3-4 Flashcards
(26 cards)
Energy
Ability to do work
Chemical energy
Energy stored in chemicals and released when chemicals react
Electromagnet
Coil of insulated wire that bromides a magnet when current flows through
Commutator
split ring that breaks the flow of electricity for a moment and then
reverses the connection of the coil
Brushes
Mechanism that makes electrical contact without moving commutator
Armature
Rotating shift and coil in motor or generator
Direct current
Current that flows through in one direction
Alternating current
Current that flows back and forth 60 times per second
Electromagnetic induction
Generation of electrical current by changing magnetic field
Transformer
Device that changes electricity at one voltage into electricity at a different voltage
Kilowatt hour
Unit of energy
Law of conservation of energy
Fundamental principle that energy cannot be created or destroyed
Efficiency
Ratio of useful energy output to the total energy input in a device or system
Turbine
Machine that uses the flow of a fluid to rotate a shaft
Fossil fuels (hydrocarbons)
Fuel from dead organisms
Geothermal energy
Energy deprived form the internal heat of earth
Biomass
Organic matter used as an energy
Fuel cells
Primary cells that generates electricity from a chemical reaction with a fuel
Non-renewable resource
Resources that cannot be replenished
Renewable resource
Resource is replenished and can be used forever
Fly ash
Fire airborne ash produced by burning coal or other solid fuels
Sustainability
Using resources without harming the environment or using up resources for future generations
Binary numbers
Number having 2 as the base and having only ones and zeros
