## ch 20 science

##### Created by:

becastle13  on April 12, 2011

##### Classes:

7b

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# ch 20 science

 static electricitybuildup and discharge of electrons
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#### Definitions

static electricity buildup and discharge of electrons
electric field area around particle where charge is detectable
proton positively charged atoms
electron negatively charged atoms
law of static charges like repel, opposites attract
static discharge release or loss of static charge
friction rubbing 2 different materials together
induction passing electrons without contact
conduction passing charges through a conducting material
friction, conduction, induction 3 ways of transferring electrons
lightening atmospheric static discharge
thunder airs rapid expansion due to lightening's super-heating
5 miled per sec determining lightenings distance
electroscope used to detect lightening, not type of charge
electricity flow of electrons through a conduction circuit
electrical potential potential energy per election
potential difference difference in energy between 2 places
voltage unit of potential difference
V symbol of voltage
voltage source creates a potential difference in a circuit
resistance to electron flow affects amount of current flow
I symbol of current
Ω symbol for OHM
OHMS unit of resistance
Greg Ohm who named the unit of resistance after his name
OHM's law relates resistance, voltage and current
R=V/I OHM's law (equations)
series circuit only path for electron flow
parallel circuit multiple paths for electron flow
short circuit allows electrons to take an unintended path
resisting current preventing current flow
grounding current goes into ground if shorted
lightening rods discovered by b. Franklin, ground lightening
Benjamin Franklin who invented the lightening rods
benjamin franklin who discovered static charges
circuit breakers protect circuits from over load
fuse thin wire which opens when circuit is over heated

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