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### 25 Cards in this Set

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 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