# Shared Flashcard Set

## Details

Electromagnetism
Conceptual Science
31
Physics
11/21/2007

Term
 Coulomb's Law
Definition
 Relationship Between electrical force is charge and distance  F= K q1q2/ d (sq)
Term
 Conductor
Definition
 Material has freely charged particals that allow easy flow of electricity
Term
 Electric Potential
Definition
 The electric potential enery per unity of charge, measure in volts, and often called voltage Electric Potential= Voltage: Charge
Term
 Capacitor
Definition
 Conducting plates that seperate and store electrical charge.  They have zero net charge since there are equal number of opposite charges.
Term
 Power
Definition
 Current (C/s) X Voltage (J/C)  Watts (J/ s)
Term
 Direct Current
Definition
 Usually a battery, that provides electrons through a voltage differents.  A 9 volt batter is 9 volts/ coulomb of charge
Term
 Alternate Current
Definition
 An electric field that wiggles the electrons in a "back and forth" motion.   Alternative current is require for magnetic induction.
Term
 Converting A/C to D/C
Definition
 A diode acts as a one way valve allowing electrons that flow in one direction to pass.  Then a capacitor createds a retarding affect to even the motion, and supply a steady flow.
Term
 Parallel Circuit
Definition
 Each series is connected to the source so the voltage is the same.  However, more current will flow throught the path of least resistance. The more series is in the circuit, the less the resistance.  So the sum of all resistance is less and any one series.  Resistance= 1/s1+ 1/s2+ 1/s3
Term
 Series Circuit
Definition
 Voltage pass through one series before entering anther. The resistance applies seperately to each series.   Resistance= S1+ S2+ S3
Term
Definition
 An electric field is created in any region of space in which a magnetic field is changing with time.  The magnitude is proportional to the rate that the magnetic field changes.  The direction of the induced firld is at right angles of the changing magnetic field.
Term
 Generator
Definition
 Uses a mechanical motion to spin a wire through magnetic field and created electrical energy.
Term
 Armature
Definition
 Iron core wrapped around copper and is spun by steam or falling water through a magnetic field to created electric energy.
Term
 MHD Power
Definition
 Using a stream of plasma that shoots through a magnetic field by combustion or nuclear compression to create electrical energy that is capture by plates.  The wasted heat is used to steam water for steam turbine generators.
Term
 Transformers
Definition
 Creating magnetic induction by placing a primary coil next to a secondary coild.  The change in magnetic field of the primary coil will create electricity to the secondary coil.  # of loops = # of loops         Voltage              Voltage
Term
 Field Induction
Definition
 A magnetic induction is created by change in the electric field.
Term
 Electromagnetic Induction
Definition
 Induction of voltage by change in magnetic field over time  Voltage= # of loops X change in magnetic field/Time
Term
 Current
Definition
 The flow of electric enery over resistance.  The appliance in the home provides the current.  Current (Amps)= Voltage (J/C)/ Resistance (Ohms)
Term
 Magnetism
Definition
 Depends on moving charge
Term
 Magnet
Definition
 Atoms that have electrons that do not spin in opposite direction as to cancel out the magnetism.  Iron, Cobalt, Nickel Iron atoms have 4 electrons whose electric spin is uncancelled
Term
 Charged Particles in Magnetic Field
Definition
 A moving charge particle that crosses the magnetic field will change direction so that it will be perpendicular to the magnetic field.  The stronger the moving charge, the more perpendicular.  The more perpendicular, the stronger the magnetic force.   If it travels parallel to the magnetic field then there will be zero magnetic force, and no deflecting.
Term
 Electric Meter
Definition
 A stationary magnet in a coil.  When electricity passes through the coil, then each coil will cause the magnet to react
Term
 Electric Motor
Definition
 Current is made to change direction of the coil by half rotation.  Then coil continues in motion just in time for the current to reverse and force the coil to continue in another 1/2 rotation.   Output: Mechanical energy
Term
 Power Transmission
Definition
 Current produces thermal and enery loss.  So, power station step up the voltage to lower current.  Then at substantion, voltage is step down for higher current.
Term
 Electric Field
Definition
 Created from gravitation, comes in nuclear and gasoline.  When it vibrate in the right frequency, then we can see electricity as light.
Term
 Conservation of Charge
Definition
 Charge is never created or destroyed
Term
 Coulomb's Formula
Definition
 The electrical force is the charge of electron over distance
Term
 Electrons
Definition
 Loosly packed, outer shell, and therefore they are easiest to transfer and migrate
Term
 Electric Field
Definition
 Stronger as it is closer to the source, it is stronger than gravity but it can be reverse or neutralize N/ C
Term
 Reducting Resistance
Definition
 Thicker wire, better conductors (superconductor), temperautre, material
Term
 Electric Potential Vs. Electric Potential Energy
Definition
 2X the Coulomb of charge with have twice the electric potential energy but electric potential is the same.
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