Unit 4: Electrical Principles and Technologies Flashcards
The first law of thermodynamics
Energy cannot be created or destroyed only transferred from one form to another
The second law of thermodynamics
No transfer of energy is 100% efficient
Thermal energy
Heat energy
Electrical energy
Energy from electricity
Chemical energy
energy stored in chemical and released with chemical reactions
(eg. Fire)
Mechanical Energy
Energy created by a moving object
(eg. wind turbine)
Electrochemical Cell
A device that creates electrical energy from chemical reactions. (eg. Cooper and Zinc in saltwater)
Anode
Electrode that is negativly charged
Cathode
Electrode that is positively charged
Electrolyte
liquid or gel containing Ions. The electrolyte becomes conducted through ion movement.
Electrode
An electrical conductor where electricity enters and leaves.
Wet cell
Cell with a liquid or paste electrolyte. (car battery has a liquid electrolyte)
Dry cell
A cell with a solid electrolyte. (eg. Some types of batteries)
Primary cell
Cell that creates an electrical current through a chemical reaction.
Secondary cell
An electric sell that is capable of being recharged.
Salt bridge
Tube that contains electrolyte usually in gel form that provides contact between two solutions.
Generator
A machine that converts mechanical energy into electricity
Armature
The rotating coil of a electric motor.
Electromagnet
A metal core that turns into a magnet due to the electrical current.
Alternating current
Electrical current that can reverse its direction. Usually used in power tools/supplies.
Magnetism
Attractive or repulsive forces created by electrical charge.
St louis Motor
A motor that creates an electrical current from mechanical energy. The type of current power used is direct current.
