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Physics

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by

joey wong

on 27 April 2015

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Transcript of Physics

CHARGES
electric discharge
Current
electricity
OHM'S LAW
SAFETY
SOURCES
OF
ENERGY
ENERGY
Hydro-
electricity
Solar
Wind
Geothermal
Biomass
Landfill gas
Tidal Energy
Fossil fuels
Nuclear
Renewable
Non-
renewable
opposites attract
Like charges repel
charges exert
forces on one another
force decreases with an increase in distance between the two charged objects
force increases
with a decrease in distance between
the two
charged objects
force increases with more
charges added to the two charged objects
Friction
Induction
Methods of
Charging
Conduction
Types
of
charges
Rubbing of electrons off an object & onto another
Neutral
positive
Direct contact with
another object, the electrons flow from one object to another
Rearrangement of electrons
within objects. Hence, a
charged object will attract
a neutral object if induction
occurs
Stationary
charges
Build up of
charges on
an object
Law of
electric charges
Insulators
Conductors
an object is charged when it loses or gains electrons
Material that
tightly bounds
electrons; bad
electron flow
material which allow the electrons to freely travel to a neighboring atom

ex:
Rubber,
wood,
plastic
ex:
copper,
aluminum,
gold, and
silver
amount of
force between
objects depend
on three things
distance
Voltage
symbol: V
Current
symbol: I
ResistanceSymbol: R
size of the
charge
V=RI
negative
-
+
Measured in
volts with
a voltmeter
Electroscopes
an instrument for
detecting and measuring
static electricity
E=PT
measured in ohms
with a multimeter
measured in amperes
with an ammeter
also known as
potential difference
of electric potential
makes electrons within conducting material flow
resistors
how much an object
opposes current
an object that slows
down electron flow
rate at which charges
pass a given point
Conventional
current
Direct
current
Electron
current
electrons flows from negative
terminal to positive
terminal
electrons flows from positive terminal
to negative terminal
flows in one direction only
through an electric current
Loss of charges due to electrons moving
what to do in lightning/thunder storm
build up of charges
due to wind
never stand underneath anything tall (ex: tree) b/c electrons are escaping to ground & anything tall helps them get to ground faster
trees are better conductors than air so the charges will go to the tree
STATIC
ELECTRICITY
Van der Graaff Generator
type of static electricity generator
that seperates large amounts of charges
Power
symbol: P
P=VI
P=I²R
all loads have
resistance, known as
measured in watts
w
measured in joules
or kilowatthours
1w=1j/second
j or kWh
continual movement of electrons
has
are an example of
an example of
continual discharge is know as
has
complete
circuits

uses
load
loop
closed path
battery
lightbulb
determines brightness
example:
requires:
series
circuit
circuit with only one path
parallel
circuit
circuit with more
than one path for
the electrons
to flow
tw0 electrodes &
electrolytes
open/closed
circuits
switch

determined by:
made of
ions
electrolytes
create
loss/gain of electrons
converts chemical
energy into
electrical energy
electrons then
flow from one
electrode to another
when they are
connected
electrons flow from negative terminal to positive or vice versa
converts electrical energy into other forms
broken into smaller
units: cells
frayed wires &
pulling from
the cord
short
circuit
can result in
current departs
from pathway
grounding
has plenty of charges
to give & lots of room
for new charges
can have current w/out
complete circuit
fuses &
circuit breaker
prevents
overheating
resistors heat up b/c of current until fire

third
prong
charges go to ground prevents shocking hazard
outlet
first prong
second
prong
hot prong
wire
neutral
wire
incandescent
emits light using
heat energy
compact
fluorescent
light
design to replace
Fluorescent
has low
emission of light by
substance that has
absorbed light
purple
= connection line
=connection description
PHYSICS
Joey Wong
Yang Lin

depends on:
turn on ur volume :D
The End :)
Full transcript