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Electricity
OA3.1
Understandin
g electricity
and
magnetism
Electricity
Warm Up
1. An atom lost an
electron. It now
has a ________
charge.
2. An atom gained an
electron. It now
has a ___________
charge.
Vocab word
1.
Electrical
conductor
Definition
A material that
electricity
travels through
easily
Examples: Metals,
water, your body!
Picture
Vocab word
2.
Electrical
insulator
Definition
A material that
electricity does
NOT travel
through easily
Examples: plastics,
wood, glass, and
rubber
Picture
Insulator
Utility Pole with
insulators
Vocab word
3. Battery
Definition
Changes chemical
energy into
electrical
energy
Stores up (potential
energy) the
chemical energy
Picture
There are 2 kinds of batteries:
Dry Cell
and
Wet Cell batteries
This is a dry cell.
The zinc container of the
dry cell contains
a moist chemical paste
surrounding a carbon rod
suspended in the middle.
Most batteries you will find at
home: used for flashlights,
smoke alarms, kids toys are
DRY CELL Batteries.
dry cell Batteries:.
A chemical reaction
between the metal case
and the paste inside
causes electrons to
build up on the metal,
making it negative. The
rod in the middle
becomes positive.
Current flows when the
two poles are
connected.
Wet cell batteries are most commonly
associated with automobile batteries.
A wet cell contains
two metal plates made
in an acid.
Chemical reactions
between the plates and
the acid cause
electrons to build up at
the negative pole.
When the poles are
connected, electrons
Vocab word
Definition
4.
Electrical
current
Steady flow of
electricity
Will move in a wire
along a path or
circuit.
Picture
Remember static electricity?
Static electricity doesn’t move until it discharges! Its
different than an electrical current!
The flow of electricity in current electricity has electrical
pressure or voltage.
Electric
charges flow
from an area of
high voltage to
an area of low
voltage.
Vocab word
5.
Generator
Definition
A machine that
changes some
other kind of
energy into
electrical energy
Sometimes, people
have generators
hooked up to
their houses just
in case they lose
electricity
Picture
Closure questions : True or False?
1. Metals are good examples of conductors.
2. Electricity travels easily through an insulator.
3. Static electricity is what helps a balloon stay
“stuck” on a wall.
4. In electricity, opposites attract.
5. People use generators to create solar power.