# Shared Flashcard Set

Electricity Quiz
notes.
30
Physics
11th Grade
03/02/2009

## Cards Return to Set Details

Term
 potential difference
Definition
 voltage; difference between magnitude of charges
Term
 chemical reaction in battery
Definition
 produces electron on the anode; releases charge and the potential difference between the terminals allows the charge to flow
Term
 when chemical reactions on a battery stop
Definition
 when its not hooked up to anything because there's too many electrons
Term
 why negative charges in the battery don't move through the battery to the positive terminal
Definition
 some electrons do but most don't because the internal resistrance caused by the materials in the battery is very high
Term
 path that electrons in an electric field take
Definition
 the path of least resistance
Term
 when a copper wire is placed between the terminals of a battery...
Definition
 the electrons will readily flow through the metal conductor because its the path of least resistance
Term
 circuit
Definition
 continuous path from the negative terminal (anode) to the positive terminal (cathode)
Term
 current
Definition
 continuous flow of electrons in a circuit
Term
 electric current in a wire is...
Definition
 the net amount of charge that passes through a wires' cross sectional area over an interval of time
Term
 equation for current
Definition
 I=change in charge divided by change in time
Term
 unit for current
Definition
 ampere
Term
 ampere
Definition
 named after French physicist Andre Ampere
Term
 1 Ampere =
Definition
 1 Coulomb per second
Term
 battery
Definition
 device that produces a potential difference by chemical reactions
Term
 as the current flows through the wire...
Definition
 the electrons ineract with each other and the atoms in the metal
Term
 collisions with electrons and atoms...
Definition
 slow down the current
Term
 different materials...
Definition
 offer different resistances because of the density of the material and the size of the atoms
Term
 Ohms
Definition
 what value of resistance is measured in
Term
 if something is less dense, the collisions...
Definition
 decrease
Term
 direct current (DC)
Definition
 when the current moves in one direction
Term
 alternating current (AC)
Definition
 when the current flows back and forth
Term
 what changes in the physical properties of the wire will do
Definition
 change the resistance
Term
 what happens when you increase the thickness of the wire
Definition
 it allows electrons to have more paths to take, decreasing the resistance
Term
 what happens when you extend the length in the wire
Definition
 the potential difference has to act over a longer distance, there are more intervening atoms, number of collisions increase, and resistance increase
Term
 what happens when you increase the temperature in the wire
Definition
 it speeds up the motion of the atoms in the wire
Term
 vibration of the atoms causes...
Definition
 an increase in the rate of collision between the atoms and the flowing electrons, increasing resistance
Term
 equation for voltage
Definition
 V = IR; current times resistance
Term
 resistance
Definition
 value of how much a material will slow down the charge
Term
 when the breaker is tripped
Definition
 when too much electricity is fun the wires heat up and are shut off to prevent overheating
Term
 symbol for Ohms
Definition
 Ω
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