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RAD150 Chapter 4

QuestionAnswer
Define electrostatics study of stationary electric charges
What is the smallest unit of electric charge? electron
What is the fundamental unit of electric charge? coulomb
1 coulomb=? 6.3x10^18 electron charges
What is Coulomb's Law? electrostatic force directly proportional to product of charges & inversely proportional to square of the distance F=k(Q1Q2)/d^2
Define electrodynamics study of electric charges in motion
What is current and how is it measured? number of electrons flowing; amperes
1 ampere=? 1 coulomb of electrons flowing through a conductor per second
Electromotive force refers to ________ electric potential
Define electric potential the force with which electrons travel
How is electric potential measured volts
1 volt=? 1 joule per coulomb
Resistance depends on what 4 factors? material's conductivity, length, diameter and temperature
What are the 4 electric states of matter? insulator, semiconductor, conductor, superconductor
What is an example of an insulator? glass, clay, rubber
What is an example of a semiconductor? silicon, germanium
What is an example of a conductor? copper, aluminum, water
What is an example of a superconductor? niobium, titanium
What is Ohm's Law? V=IR (voltage=current X resistance)
What is electric power? How is it measured? the rate at which energy moves or is used; watts
1 watt=? 1 ampere current flowing through 1 volt electric potential
What is the formula for power? P=IV
What are the 3 classifications of magnets? natural, artificial permanent, electromagnet
What are the 4 magnetic states of matter? nonmagnetic, diamagnetic, paramagnetic, ferromagnetic
Define nonmagnetic & give an example unaffected by magnets; wood, glass
Define diamagnetic & give an example weakly repelled & can't be magnetized; water, plastic
Define paramagnetic & give an example weakly attracted to magnets; gadolinium, platinum, aluminum
Define ferromagnetic & give an example can be strongly magnetized; iron, nickel, cobalt
Magnetic force is proportional to _______. the product of the pole strengths divided by the distance between them
What is flux density and how is it measured? magnetic field strength in teslas
What is a magnetic dipole? small magnet created by electron orbit
What is a magnetic domain? accumulation of atomic magnets with aligned dipoles
What is magnetic permeability? the ability of a material to attract lines of magnetic field intensity
Define induction the process of making ferromagnetic material into a magnet
A coil of wire is called a _____. solenoid
What did Oersted's experiment reveal? an electric current is induced if part of a circuit is in a changing magnetic field
Faraday's Law states that the magnitude of an induced current depends on what 4 factors? strength of magnetic field, velocity of field moving past conductor, angle between conductor and field, number of turns in conductor
A coil of wire in a generator is called the _____. armature
How does a generator work? an armature is placed between opposing magnetic poles, mechanically turning the armature induces an electric current within the magnetic field
What are the 3 types of transformers? closed-core, shell-type, autotransformer
What is the transformer law? the change in voltage is directly proportional to the turns-ratio of the coils Vs/Vp=Ns/Np
A turns ratio >1 is a _______ transformer, a turns ratio <1 is a _______ transformer. step-up; step-down
As voltage in a transformer changes, _____ changes inversely. current
Total resistance in a series circuit=? sum of individual resistances
Total current in a series circuit=? current through each element
Total voltage in a series circuit=? sum of individual voltages
Total resistance in a parallel circuit=? reciprocal of sum of 1/each individual resistance
Total current in a parallel circuit=? sum of currents through each element
Total voltage in a parallel circuit=? voltage across each element
A step-up transformer will have _____ voltage and _____ current in the second coil compared to the first. higher; lower
A step-down transformer will have _____ voltage and _____ current in the second coil compared to the first. lower; higher
Created by: SCash21