Matter, Energy And Electricity Flashcards
In simplest terms, what is Coulomb’s law?
That opposite charges attract. It is based off the distance between the 2 bodies, and their individual charges.
What are the subatomic particles and their charges?
Electron (-), Proton (+), Neutron (neutral)
In order, what are the 4 main conductors. From highest conductivity to lowest.
1) silver 2) copper 3) gold 4) aluminum
What is magnetism?
It is defined as the property of a material which enables it to attract pieces of iron.
What is reluctance?
The opposition that a material offers to the magnetic lines of force.
what are temporary magnets?
Materials that easily lose magnetic strength. These materials will also have a low reluctance.
What is residual magnetism?
The amount of magnetism which remains in a temporary magnet.
What is retentivity?
The ability to retain an amount of residual magnetism.
What is permeability?
The ease with which magnetic lines of force distribute themselves throughout the material.
Describe a magnetic lines of force path.
Emanate from the North Pole and enter the South Pole.
What is electromotive force? (EMF)
The difference potential between two bodies. Also called voltage.
What are the 6 methods for producing voltage?
Friction Pressure (piezoelectricity) Heat (thermoelectricity) Light (photo electricity) Chemical Action Magnetism
What is ohms law?
E (voltage) = I (current) x R (resistance)
Measured in Volts = Amperes x Ohms
What is resistance?
The opposition to current flow.
Resistance of a conductor is inversely proportional to its _____.
Cross sectional area.
