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25 Cards in this Set

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  • Back
charge
a property that gives rise to attraction or repulsion
charge is...
conserved- chare is not created or destroyed, we move charge
quantized- comes in fixed amounts
conductors
metals...electrons are loosely held in place and are free to move between atoms(get current from)
Insulator
wood, plastic, rubber... electrons are held tightly in place- they dont move between atoms
electricity wants to be in...
equillibrium
ways to charge objects
1. friction- rubbing objects together, moving electrons from 1 object to another
2. Conduction- charging by contact, touching a charged object to an uncharged object
3. induction- charging by proximity
Coulomb's law
Fe= kqq/r2
coplanar steps for solving the problem
1. FBD
2. Magnitudes of forces (F31)(F32)
3. Components (x and y)
4. tangent theta
Electric Field
defines the way a positive charge would go or field lines start on positive and end on negative
Electric Current
(I) change in charge over change of time
I = Q/t= C/s= Amperes
Conventional current
the way a positive charge would go
Flow of energy
- the energy flow from the higher temp to the lower temp
thermal equillibrium
the flow ceases when both ends reach the same temp
flow of charge
charges flow when they are pushed
- when flow is negative, electrons are flowing
- when flow is positive, protons are flowing
-there must be a difference in potential in order for it flow from one end to another
Electric current
flow of electric charge
Ohm's law
V=IR
drift velocity
electrons drifting in a certain direction
- as wire heats up, resistance goes up
cross sectional area, length and drift velocity relationships
1. as cross section increases, the resistance decreases
2. length and resistance are proportional
3. resistivity and resistance are proportional
wire differences and relationships
wire gets long- resistance gets big
wire gets fat- resistance gets small
superconductivity
zero resistance, cooler wire, easier for electrons to get thhrough (low temp)
hot wire and cold wire
hot wire- electron moves faster= drift velocity is slow
cold wire- electrons slower- drift velocity faster
series circuit
defined by having 1 path
wat to do to find Req in a series circuit
add up all the resistors (measured in Ohms)
parallel circuits
more then one path
wat to do to find Req in a parallel circuit
take the numbers and put a one over them and then get the answer and do x-1 on calculator to get R