# Shared Flashcard Set

## Details

Radiographic Physics 1 - Unit 8 & 9
Electrodynamics & Electromagnetism
66
Physics
07/24/2013

Term
 When 2 charges are positioned close to each other they possess
Definition
 electric potential
Term
 unit for electric potential
Definition
 volt
Term
 other names for electric potential
Definition
 electric pressurevoltagepotential difference
Term
 3 Componets of a simple circuit
Definition
 1. current (amps)2. voltage (volts)3. Resistance (ohms)
Term
 the "force" of electron flow
Definition
 voltage/electric potential
Term
 Voltage always flows from:
Definition
 high negative potantial to low negative potential
Term
 Electrodynamics
Definition
 electrons in motion
Term
 circuit
Definition
 the pathway over which electrons flow
Term
 conductor
Definition
 allows electrons to flow freely
Term
 superconductor
Definition
 a conductor with very little resistance to electrons
Term
 nonconductor
Definition
 does not allow electrons to flow; used as an insultor
Term
 semiconductor
Definition
 sometimes a conductor and sometimes not
Term
 parallel circuit
Definition
 an electric circuit designed to send electrons through various resistance devices by giving each component its own branch
Term
 series circuit
Definition
 an electric cirsuit designed to send electrons through various resistance devices by linking them to one another
Term
 where do negative charges reside?
Definition
 on the surface
Term
 Factors influencing resistance
Definition
 1. Material - type of conductor; good conductor=less resistance2. Length of conductor - increased legnth=increased resistance3. Diameter of conductor - decreased diameter=increased resistance4. Temperature - increased temp=increased resistance
Term
 Name 2 types of circuits
Definition
 1. Series2. Parallel
Term
 Ohm's Law
Definition
 The voltage across the total circuit or any portion of the circuit is equal to the current times the resistance.V=IR
Term
 In a series circuit, what is contant?
Definition
 Current is constant
Term
 In a series circuit, what will vary with resistance?
Definition
 Voltage will vary with resistance
Term
 In a parallel circuit, what is constant?
Definition
 Voltage is constant
Term
 In a parallel circuit, what will vary with resistance?
Definition
 Current will vary with resistance
Term
 capacitator
Definition
 stores electrical enegery
Term
 Who proved a magnetic field can produced electricity?
Definition
Term
 Who laid the groundwork for a generator?
Definition
Term
 Capacitance
Definition
 the amount of charge stored; Farad is unit of measurement
Term
 The amount of charge stored
Definition
 Capacitance
Term
 Stores electrical energy
Definition
 Capacitator
Term
 Armature
Definition
 a coil wire that acts as a conductor
Term
 What kind of "ring" does a DC generator have?
Definition
 commutator ring/split ring
Term
 The current induced on the armature of a generator will always be _____.
Definition
 Alternating Current
Term
 1 AC cycle takes place in _______ sec.
Definition
 1/60 sec = 60cps
Term
 1/2 AC cycle, or one pulse, takes place in _______ sec.
Definition
 1/120 sec = 120pps (60+/60-)
Term
 Electric Power
Definition
 the amount of work current can do
Term
 The amount of work current can do
Definition
 Electric Power
Term
 Unit of measurement for Power
Definition
 watt
Term
 Power equation
Definition
 P=IV
Term
 All electrical devices produce _____.
Definition
 Heat.
Term
 Power Loss Formula
Definition
 Power Loss = I^2 RThe amount of heat produced depends on the current the device draws and the resistance of the conductor
Term
 Transformer
Definition
 Electromagnetic device that allows us to transform the intensity of alternating voltage and current.
Term
 A device in which 2 coils are placed near one another without electrical connection. The number of coils differes, causing a change in current in the secondary coil, this serves to either increase or decrease the voltage.
Definition
 Transformer
Term
 Transformer perform at ____% efficiency.
Definition
 98%
Term
 Step-Up Transformer
Definition
 A transformer that has more turns on the secondary side than the primary side.
Term
 Variac
Definition
 variable transformer, can step-up or step-down voltage
Term
 Electromagnetism
Definition
 a branch of physics that deals with the relationship between electricity and magnetism
Term
 The branch of physics that deals with the relationship between electricity and magnetism
Definition
 Electrodynamics
Term
 Experiment Oersted used to link electricty and magnets.
Definition
 Compass experiment
Term
 Who demonstrated how flux lines arrange themselves around the conductor using DC current?
Definition
 Davy
Term
 impedance
Definition
 The total resistance in an AC circuit (Z)
Term
 inductive reactance
Definition
 The ability of an alternating current to witch directions, causing the opposing potential difference to induce against the incoming supply of electrons.
Term
 3 ways electromagnetic induction can happen:
Definition
 1. The magnetic field moves - the magnet moves while the conductor is stationary2. The conductor moves - the conductor moves while the magnet is stationary3. magnetic flux changes direction - magnet and conductor remain stationary
Term
Definition
 The magnitude of induced current depends on 4 factors:1. the strength of the magnetic field2. teh velocity of the magnetic field as it moves past the conductor3. the angle of the conductor to the magnetic field4. The amount of turns in the conductor
Term
 What is the direction of the induced current?
Definition
 Opposite to the direction of the action that has induced it.
Term
 2 Types of Induction
Definition
 1. Mutual Induction - the result of 2 coils being placed in close proximity with a varying current supplied to the first coil, which then induces a similar flow in the second coil. 2. Self Induction - The ability of an alternating current to switch directions, causing an opposing potential difference to induce against the incoming supply of electronsl allows direct current to flow while at the same time hindering alternating current.
Term
 Electrodynamics is:
Definition
 the study of moving negative charges
Term
 Material which allow electrons to move through them easily are termed:
Definition
 conductors
Term
 Ohm's law is represented mathematically by:
Definition
 V=IR
Term
 In a prallel circuit, as the resistance increases the:
Definition
 Voltage remains constant
Term
 The ammeter is a device which measures current and is connected in _____ in the circuite.
Definition
 Series
Term
 The unit for electrical pressure is:
Definition
 Volt
Term
 As the length of a conductor increases, the resistance:
Definition
 Increases
Term
 The total resistance in a parallel circuit is _____ the resistance through each branch of the circuit.
Definition
 less than
Term
 The fundamental unt=it of electric charge is the:
Definition
 Coulomb
Term
 ______ denonstrated the magnetic flux lines through experimental investigation.
Definition
 Davy
Term
 Defined as the ease at which a material can be magnetized.
Definition
 Permeability
Term
 The unit for power is the:
Definition
 watt
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