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Electromagnetism
Conceptual Science
31
Physics
Undergraduate 1
11/21/2007

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Cards

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
Farraday's Law
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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